FI20235281A1

FI20235281A1 - Firearm suppressor

Info

Publication number: FI20235281A1
Application number: FI20235281A
Authority: FI
Inventors: Simo Saarenkanta; Christoph Schrödl
Original assignee: Sako Oy
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2024-08-06
Also published as: WO2024189260A1; FI131028B1

Abstract

The invention relates to a firearm suppressor, which suppressor (10) has a substantially rotationally symmetrical cylindrical form and comprises a suppressor housing (13), a rear end cap (11), a plurality of chambers (18, 19, 34, 36, 37) for expansion and burning of propellant gases and arranged inside the suppressor housing (13), a barrel opening (30), an outlet opening (20) for a projectile and a continuous channel along an imaginary center axis of the rotationally symmetrical cylindrical form of the suppressor (10) from the barrel opening (30) to the outlet opening (20) for the projectile configured to be fired by the firearm. The suppressor (10) comprises a gas turning and support frame (12). The gas turning and support frame (12) has a deflector surface (12A) configured to turn at least 50 %, advantageously 80 %, of propellant gases substantially backwards, and the gas turning and support frame (12) has an open inner space (12B) configured to provide filling and expansion of the propellant gases.

Description

Firearm suppressor

Technical field

The present invention relates to suppressors for firearms. More precisely the present invention relates to a firearm suppressor according to the preamble part of claim 1. The present invention also relates to a firearm comprising a suppressor.

Background

The noise generation in a firearm shot has three main components: muzzle blast, sonic boom and the mechanical action. In the field of noise and flash reduction of firearms has been presented quite many different constructions and devices for the same purpose i.e. to dampen the noise and flash caused by the rapid burning of propellants when the firearm is fired. As the benefits of this reduction are quite obvious, the noise of undamped firearm may exceed 140 dB, even 160 dB, and can be harmful for firearm users or anyone nearby and disturb large surrounding areas, for example by a hunting area or by a shooting range. It is also preferred to be avoided or at least minimized in military applications where the sound of the firing immediately attracts the attention of parties concerned. The better the suppressor is in terms of noise reduction and if combined to easy or simple manufacturability and to low weight, the better the suppressor is in terms of commercial interest.

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N A firearm bullet or in general a projectile, is rapidly accelerated at firing to an 3 initial velocity depending on the type of the firearm. The initial velocity means 2 30 here the velocity of the projectile when exiting the barrel or corresponding part =E of a firearm. This means that the initial velocity may be within range on about - 0,8 to 3,3 Mach (where 1 Mach is the speed of the sound when the medium is

D normal atmospheric air in about normal temperature and pressure (ntp). Thus, 2 the flow dynamics range concerned may vary from slightly subsonic to highly

R 35 supersonic flows.

In case of supersonic noise dampening, the suppressor is not capable of reducing the noise originating from the projectile breaking the sound barrier during the flight to a destination. Thus, the aim of the suppressor is to reduce as much as possible the noise generated by the muzzle blast i.e. the phase when the projectile is no longer in front of that high pressure propellant gas and the pressure is rapidly normalizing to an atmospheric pressure, the burning propellant is exiting the barrel and when the propellant residuals are burning outside the barrel. Without any kind of muzzle suppressor device, the propellant gases will expand violently to the atmosphere and produce noise.

The main operating principle of the suppressor is to provide a controlled volume to allow the gas to expand into, and preferably burn out. Thus, when the projectile exits the barrel, the muzzle blast is significantly reduced as the burning propellant is contained in a closed volume. The regular suppressors are basically formed as a closed structure as long as the projectile is inside the suppressor, which causes excess back pressure. A flow-through suppressor allows the gas to pass through the suppressor so that the back-pressure increase is eliminated or at least minimized.

As known, the firearm suppressors are typically removable attached to the ends of firearm barrels. Thus, weight of a firearm suppressor is a matter to be taken in account, when designing firearm suppressors, for example a very heavy suppressor may cause difficulties in operation of it with the firearm due to the weight causing a change in center of gravity. An important factor of the suppressor weight as attached at the end of the barrel is also that the suppressor affects to the shooting properties of the firearm and also increases the overall weight of the firearm in use.

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N The firearm suppressors are also typically designed for a certain type of a 3 firearm and for a certain caliber. Thus, a great variety of suppressors are 2 30 needed for different types of firearms and different types of ammunition

E calibers. This causes increased manufacturing, storing etc. costs. 2 The objective of the present invention is to provide a firearm suppressor 3 capable of reducing a significant amount of noise caused by the firing of a

N 35 firearm.

One objective is also to provide a suppressor construction, which is capable of producing an effective flow loss i.e. consume the flow energy inside the suppressor to different losses and thus reducing the noise caused by sudden eruption of propellant gases.

One objective is also to enable the residual burning of the propellant gas still containing some unburned propellants within the suppressor housing, thus diminishing the noise effect of suddenly burning residuals outside the barrel.

One objective is further to create an improved firearm suppressor, by which the above-described problems and disadvantages relating to known suppressors are eliminated or at least minimized.

Yet, an objective is to create an improved firearm suppressor, in which the noise eliminating properties in relation to the weight of the suppressor are optimized.

Also, an objective is to provide an improved suppressor, especially in view of its capability of burning propellant gases, its weight and its manufacturing and assembly effectivity.

Summary

In order to achieve the above objects and those that will come apparent later the firearm suppressor, is mainly characterized by the features of the & characterizing part of claim 1.

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3 Dependent claims present advantageous features and embodiments of the 2 30 invention. 7 _ According to the invention the firearm suppressor has a substantially

D rotationally symmetrical cylindrical form and comprises a suppressor housing, 2 arear end cap, a plurality of chambers for expansion and burning of propellant

R 35 gases and arranged inside the suppressor housing, a barrel opening, an outlet opening for a projectile and a continuous channel along an imaginary center axis of the rotationally symmetrical cylindrical form of the suppressor from the barrel opening to the outlet opening for the projectile configured to be fired by the firearm, wherein the suppressor comprises a gas turning and support frame, the gas turning and support frame has a deflector surface configured to turn at least 50 %, more advantageously at least 80 % of propellant gases substantially backwards, and that the gas turning and support frame has an open inner space configured to provide filling and expansion of the propellant gases.

According to an advantageous feature the deflector surface forms a curved and/or inclined and/or tapered surface at maximal area inside the gas turning and support frame and is advantageously towards the back of the suppressor concave and/or tapered and/or inclined.

According to an advantageous aspect the firearm suppressor comprises the gas turning and support frame, which turns the propellant gases backwards, i.e. back towards the barrel at the outer circumferential space of the open inner space of the gas turning and support frame, providing improved gas expansion and burning and thus, improved noise suppression. Advantageously, the firearm suppressor comprises a rear chamber and the propellant gases further form the open space and the flow opening are configured to expand to the rear chamber. The gas turning and support frame is advantageously configured also to act as a receiving part for loads, stresses and strains of the suppressor via its threaded attachment to the barrel.

According to an advantageous aspect the deflector surface of the gas turning and support frame turns at least 50 %, more advantageously at least 80 % of & the propellant gases backwards in the open space of the gas turning and

N support frame and the flow opening of the gas turning and support frame such, 3 that the propellant gases fill the open space and the flow opening substantially 2 30 evenly and maximally providing substantially even pressure distribution in the =E open space and in the flow opening as the deflector surface is substantially - curved and may comprise curved, elliptical, inclined and/or tapered shapes to

D have the backwards turning effect of the propellant gases. The deflector 2 surface is advantageously towards the back of the suppressor concave and/or tapered.

According to an advantageous aspect the gas turning and support frame is made of material, which has required strength in view of the caliber, has as low as possible density, endures the heat and chemical strain of the propellant gases. Thus, advantageous material choices are titanium and its 5 compositions, stainless steel and its special alloy options, aluminum compositions, as well as plastic and composite materials. For example density of titanium is about 4430kg/m3, density of aluminium compositions is in 6000/7000-serietypes 2680kg/m? - 2810kg/m3 density of steels is generally 7750kg/m3 — 8050kg/m3 and density of plastic materials is 900kg/m3- 1300kg/m3.

According to an advantageous aspect the rear end cap is located at the back end of the suppressor and attached inside the suppressor housing by a reopenable attachment between the suppressor housing and the rear end cap, the gas turning and support frame is attached to the rear end cap by a joint between the rear end cap and the gas turning and support frame and the gas turning and support frame is attached inside the suppressor housing by a reopenable attachment between the suppressor housing and the gas turning and support frame. The rear end cap advantageously extends partially inside the gas turning and support frame. The reopenable attachment may be a thread attachment, a locking ring attachment, a pressed-on fitting attachment or another corresponding formfitting attachment.

According to an advantageous aspect the suppressor comprises a first, at least one center and an end baffle located between the gas turning and support frame and the front end of the suppressor. The first baffle is joined to the gas & turning and support frame by a joint, joints attach the center baffle/-s to the

N adjacent baffles and the end baffle is attached to the suppressor housing by a 3 joint. The baffles are preferably U- or M-shaped forming correspondingly 2 30 shaped baffle chambers and the arms of the U- or M-shape extend backwards =E in the suppressor. The first baffle may also be located to a non-first position, - and thus the locations of the first baffle and the center baffle may be different.

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Q According to an advantageous aspect the joints are form-fitting and reopenable joints with different dimensions and shapes depending on the requirements of the joint. For example shoulder-groove joints can be used.

Especially advantageous are also tapered joints and wedge-shaped joints (fig.

5), by which controlling of loads is improved. In case of the tapered or wedge- shaped joints the inclined surfaces form a self-retaining surface towards the outer circumference of the suppressor.

According to an advantageous aspect the first baffle comprises flow holes around its perimeter. Alternatively a perforated tube-like first baffle can be used.

According to an advantageous aspect the amount and size of the flow holes in the first baffle is optimized such, that simultaneously required load resistance and maximized flow capacity is provided. Advantageously, the open area is at least 50 %, more advantageously at least 80 % of the circumferential surface area of the first baffle.

According to an advantageous aspect between the outer circumference of the baffles and the inner circumference of the suppressor housing a perimeter chamber is formed.

According to an advantageous aspect the propellant gases are configured to be guided through the flow holes to the perimeter chamber.

According to an advantageous aspect the suppressor housing is formed of one substantially U-shaped uniform part.

According to an advantageous aspect the suppressor housing has an opening & at closed end of the U-shape and the open end of the U-shape has an inner

N reopenable attachment for attachment of the rear end cap with the barrel 3 opening. The reopenable attachment may be a thread attachment, a locking 2 30 ring attachment, a pressed-on fitting attachment or another corresponding

E formfitting attachment. 2 By the suppressor according to the invention and its advantageous features 2 many advantages are achieved: The firearm suppressor is capable of reducing

R 35 a significant amount of noise caused by the firing of a firearm. The firearm suppressor construction is capable of producing an effective flow loss i.e.

consume the flow energy inside the suppressor to different losses and thus reducing the noise caused by sudden eruption of propellant gases.

Brief description of the drawings

In the following the invention and its advantages are explained in greater detail below in the sense of example and with reference to accompanying drawing, in which

In figure 1 is schematically shown an advantageous example of a suppressor of a firearm.

In figure 2 is schematically shown the advantageous example of figure 1 as a 3D drawing.

In figures 3A-3B is schematically shown an advantageous example of a gas turning and support frame of a suppressor of a firearm.

In figures 4A-4B is schematically shown another advantageous example of a gas turning and support frame of a suppressor of a firearm.

In figure 5 is schematically shown an example of the gas turning and support frame with a barrel attached thereto.

AN Detailed description & 3 During the course of the following description like numbers and signs will be 2 30 used to identify like elements according to the different views which illustrate =E the invention and its advantageous examples. In the figures some repetitive a reference signs may have been omitted for clarity reasons.

Q In figures 1-2 is schematically shown an example of the suppressor 10 comprising a suppressor housing 13 defining the outer surface of the suppressor 10. The suppressor housing 13 is formed of one substantially U- shaped uniform part, which has an opening at closed end of the U-shape and open end of the U-shape has an inner reopenable attachment 28 for attachment of a rear end cap 11 with the barrel opening 30. The travel direction of a projectile in the suppressor 10 is along the imaginary center axis of the rotationally symmetrical cylindrical form of the suppressor 10 from left to right in the figure 1 and from right to left in the figure 2. Inside the suppressor 10 and the suppressor housing 13 is arranged a number of compartments configured to allow the gas to expand into and to burn out. The suppressor housing 13 comprises reopenable attachments 27, 28 for a gas turning and support frame 12 and the rear end cap 11. The reopenable attachment may be a thread attachment, a locking ring attachment, a pressed-on fitting attachment or another corresponding formfitting attachment. At one end of the suppressor 10, at the back end of the suppressor 10, in the figure 1 at the left end and in the figure 2 at the right end, the suppressor 10 comprises the barrel opening 30 for a barrel of a firearm. The suppressor 10 is attached to the front end of the barrel by a direct thread 26 for the barrel. Instead of the direct thread 26 also an interchangeable thread tubing/-s for different barrel thread sizes can be used. The gas turning and support frame 12 is configured to act as a receiving part for loads, stresses and strains of the suppressor 10 via its attachment 26 to the barrel. At another end of the suppressor 10, at the front end of the suppressor 10, in the figure 1 at the right end and in the figure 2 at the left end, the suppressor 10 comprises an outlet opening 20 for the projectile in an end baffle 17. A continuous channel for the projectile is formed along the imaginary center axis of the rotationally symmetrical cylindrical form of the suppressor 10 from the barrel opening 30 to the outlet opening 20 for the projectile. Thus, the barrel opening 30 for the projectile to pass through the suppressor 10 extends through the suppressor 10 along the imaginary center & line of the suppressor 10.

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3 The suppressor 10 comprises the rear end cap 11 at the back end of the 2 30 suppressor 10 attached by the reopenable attachment 28 inside the = suppressor housing 13. In this example the rear end cap 11 extends as an - extended part 11A a distance inside the suppressor housing 13 and a space x 19, a rear chamber 19 is formed between the outer circumference of the end 2 cap 11 and the inner circumference of the suppressor housing 13. The gas

R 35 turning and support frame 12 is attached to the rear end cap 11 by a joint 21 between the rear end cap 11 and the gas turning and support frame 12 located at the front end of the extended part 11A of the rear end cap and inside the suppressor housing 13 via the reopenable attachment 27 between the suppressor housing 13 and the gas turning and support frame 12. The rear end cap 11 extends partially inside the gas turning and support frame 12. The suppressor 10 also comprises seals (not shown) between the parts and elements for ensuring a tight and gas-sealed construction, where needed.

The gas turning and support frame 12 has a deflector surface 12A, which is towards the back of the suppressor concave, and which turns the propellant gases substantially backwards, and an open inner space 12B i.e. the rear chamber 19, providing improved filling and improved expansion of the gases and thus, improved noise suppression. The deflector surface is located at outer circumferential area of the open inner space 12B i.e. around the projectile channel. The barrel does not extend the full length of the barrel opening 30 as shown in the figure by line 30E indicating the end of the barrel in the barrel opening 30, but instead a clearance is provided between the end of the barrel 30E. This provides improved turning of the propellant gases. The gas turning and support frame 12 has a deflector surface configured to turn at least 50 %, more advantageously at least 80 % of propellant gases substantially backwards. The deflector surface 12A may comprise curved, elliptical, inclined and/or tapered shapes. The deflector surface is towards the back of the suppressor concave and/or tapered. The gas turning and support frame 12 is a uniform structure made of one piece or of two or more permanently attached pieces for example by welding.

The gas turning and support frame 12 is attached by the reopenable attachment 27 extending to substantially whole length of the gas turning and & support frame 12 to the inner circumferential surface of the suppressor housing

N 13 between the rear chamber 19 and the perimeter chamber 18 in this 3 example. Thus, improved balance of the suppressor is provided as the center 2 30 of gravity is close to the attachment point and supporting the suppressor =E structure and dividing loads more equally within the suppressor. The gas - turning and support frame 12 is configured to receive and distribute the loads

D effecting in the suppressor 10 and provides a self-supporting suppressor 10, 2 as well as provides protection against heat and chemical effects of the

R 35 propellant gases. The support frame 12 always supports the structural integrity of the suppressor 10 by taking up heaviest pressures and temperatures. The support frame 12 is a uniform structure made of one piece or of two or more permanently attached pieces, for example by welding.

The gas turning and support frame is made of material, which has required strength in view of the caliber, has as low as possible density, endures the heat and chemical strain of the propellant gases. Thus, advantageous material choices are titanium and its compositions, stainless steel and its special alloy options, aluminum compositions, as well as plastic and composite materials.

For example density of titanium is about 4430kg/m3, density of aluminium compositions is in 6000/7000-serietypes 2680kg/m3 - 2810kg/m3 density of steels is generally 7750kg/m3 — 8050kg/m?3 and density of plastic materials is 900kg/m3- 1300kg/m?3. Especially in respect of the location of the gas turning and support frame 12 in the suppressor 10 being most sensitive titanium may be considered very advantageous material choice.

The suppressor 10 further comprises the baffles 14, 16, 17 located between the gas turning and support frame 12 and the front end of the suppressor 10.

Next to the gas turning and support frame 12 is located a first baffle 14 comprising flow holes 15 around its perimeter and thereafter a center baffle/-s 16 and an end baffle 17 are located. The example of the figure comprises one center baffle 16. The first baffle 14 may also be located to a non-first position, and thus the locations of the first baffle 14 and the center baffle 16 may be different than the one presented in the figure. The end baffle 17 is located inside the front end of the suppressor housing 13 and the suppressor 10 comprises an outlet opening 20 for the projectile in the end baffle 17. Through the flow holes 15 the propellant gases are guided effectively to the perimeter & chamber 18 for improved expansion of the gases and thus, noise suppression.

N The amount and size of the flow holes 15 in the first baffle 14 is optimized 3 such, that simultaneously required load resistance and maximized flow 2 30 capacity is provided. Advantageously, the open area is at least 50 %, more =E advantageously at least 80 % of the circumferential surface area of the first - baffle. The first baffle 14 is joined to the gas turning and support frame 12 by

D a joint 22 i.e. a rear end joint 22 for the first baffle 14. Joints 23 attach the 2 center baffle/-s 16 to the first baffle 14 and to the end baffle 17. The end baffle

R 35 17 is attached to the suppressor housing 13 by a joint 24, a front-end joint 24 for the end baffle 17. Between the outer circumference of the baffles 14, 16,

17 and the inner circumference of the suppressor housing a perimeter chamber 18 is formed.

The suppressor 10 according to the example of figures 1-2 comprises for expansion and burning the propellant gases the baffle chambers 34, 36, 37 inside the baffles 14, 16, 17, and the perimeter chamber 18 around the baffle chambers 34, 36, 37 and the baffles 14, 16, 17 inside the suppressor housing 13, and the rear chamber 19. The baffles 14, 16, 17 are preferably U- or M- shaped forming correspondingly shaped baffle chambers 34, 36, 37. The arms of the U- or M-shape extend backwards in the suppressor 10.

The joints 21, 22, 23 attaching the inner parts to the next part are located at respective ends of respective parts: the rear end cap 11, the gas turning and support frame 12, the first baffle 14, the center baffle/-s 16 and the end baffle 17, and are reopenable joints, preferably form-fitting joints with dimensions and shapes depending on requirement of the joint. For example fitting joints and/or shoulder-groove joints providing for easy and simple mounting of the inner parts to each other can be used. Also, the joint 24 between the end baffle 17 and the suppressor housing 13 is a reopenable joint, preferably a form-fitting joint with dimensions and shape depending on the requirements of the joint.

For example, a fitting joint and/or a shoulder-groove joint providing for easy and simple mounting of these parts to each other can be used. This also provides the modularity as these parts can easily be changed to required caliber and to adjust the sizes of the perimeter chamber 18 and the sizes and/or the number of the baffle chambers 34, 36, 37 inside the suppressor housing 13. Especially advantageous are also tapered joints and wedge- & shaped joints (fig. 5), by which controlling of loads effecting the joint 22, 23, 24

N is improved. In case of the tapered or wedge-shaped joints the inclined 3 surfaces form a self-retaining surface towards the outer circumference of the 2 30 suppressor. 7 _ The assembly of the suppressor 10 is performed in the assembly direction S

D i.e. from the back part of the suppressor. First by the reopenable joints 22, 23 2 the support frame 12, the first baffle 14, the center baffle/-s 16 and the end

R 35 baffle 17 are joined to one unity, which is attached by the joint 24 and the reopenable attachment 27 to the suppressor housing 13. The rear end cap 11 secures that the support frame 12 stays at its location. The support frame 12 is attached to the suppressor housing by the reopenable attachment 27 and the rear end cap 11 is attached by the reopenable attachment 28. Thus, between the support frame 12 and the rear end cap 11 an interface with contact between the support frame 12 and the rear end cap 11 is formed.

In figures 3A-3B is schematically shown an example of a gas turning and support frame12 of a suppressor of a firearm. The gas turning and support frame 12 has a deflector surface 12A, which is towards the back of the suppressor concave, and which turns the propellant gases substantially backwards, and an open inner space 12B i.e. the rear chamber 19 providing improved filling and improved expansion of the gases and thus, improved noise suppression. In this example the deflector surface 12A has a planar-like form with rounded edge areas. The deflector surface 12A is located at front and at outer circumferential area of the open inner space 12B i.e. around the projectile channel. The gas turning and support frame 12 comprises at least one support element 12C between its outer and inner structure to provide for an optimized volumetric flow rate through flow opening 12D for the propellant gases turned by the deflector surface 12A to flow backwards. The gas turning and support frame 12 has a deflector surface 12A configured to turn at least 50 % of propellant gases substantially backwards. The deflector surface 12A may comprise curved, elliptical, inclined and/or tapered shapes. The deflector surface is towards the back of the suppressor concave and/or tapered.

The gas turning and support frame 12 has on its outer surface the reopenable attachment 27 extending to substantially whole length of the gas turning and & support frame 12 for attachment to the inner circumferential surface of the

N suppressor housing. ihus, improved balance of the suppressor is provided as 3 the center of gravity is close to the attachment point and supporting the 2 30 suppressor structure and dividing loads more equally within the suppressor. =E The gas turning and support frame 12 is configured to receive and distribute - the loads effecting in the suppressor 10 and provides a self-supporting

D suppressor 10, as well as provides protection against heat and chemical 2 effects of the propellant gases. The support frame 12 always supports the structural integrity of the suppressor 10 by taking up heaviest pressures and temperatures. The support frame 12 is a uniform 10 structure made of one piece or of two or more permanently attached pieces, for example by welding.

The gas turning and support frame 12 is made of material, which has required strength in view of the caliber, has as low as possible density, endures the heat and chemical strain of the propellant gases. Thus, advantageous material choices are titanium and its compositions, stainless steel and its special alloy options, aluminum compositions, as well as plastic and composite materials.

In figures 4A-4B is schematically shown another example of a gas turning and support frame 12 of a suppressor of a firearm. The gas turning and support frame 12 has a deflector surface 12A, which is towards the back of the suppressor concave, and which turns the propellant gases substantially backwards, and an open inner space 12B i.e. the rear chamber 19 providing improved filling and improved expansion of the gases and thus, improved noise suppression. In this example the deflector surface 12A is curved to a half-circle like form. The deflector surface 12A is located at front and at outer circumferential area of the open inner space 12B i.e. around the projectile channel. The gas turning and support frame 12 comprises at least one support element 12C between its outer and inner structure to provide for an optimized volumetric flow rate through flow opening 12D for the propellant gases turned by the deflector surface 12A to flow backwards. The gas turning and support & frame 12 has a deflector surface 12A configured to turn at least 50 % of

N propellant gases substantially backwards. The deflector surface 124 may 3 comprise curved, elliptical, inclined and/or tapered shapes. The deflector 2 30 surface is towards the back of the suppressor concave and/or tapered. 7 _ The gas turning and support frame 12 has on its outer surface the reopenable

D attachment 27 extending to substantially whole length of the gas turning and 2 support frame 12 for attachment to the inner circumferential surface of the

R 35 suppressor housing. Thus, improved balance of the suppressor is provided as the center of gravity is close to the attachment point and supporting the suppressor structure and dividing loads more egually within the suppressor.

The gas turning and support frame 12 is configured to receive and distribute the loads effecting in the suppressor 10 and provides a self-supporting suppressor 10, as well as provides protection against heat and chemical effects of the propellant gases. The support frame 12 always supports the structural integrity of the suppressor 10 by taking up heaviest pressures and temperatures. The support frame 12 is a uniform 10 structure made of one piece or of two or more permanently attached pieces, for example by welding.

In figure 5 is shown an example of the gas turning and support frame 12 with a barrel located in the barrel opening 30 and attached to the gas turning and support frame 12 with a direct thread attachment 26. The barrel does not extend the full length of the barrel opening 30 as shown in the figure 5 by line 30E indicating the end of the barrel in the barrel opening 30, but instead a clearance is provided between the end of the barrel 30E. This provides & improved turning of the propellant gases as the propellant gases begin to turn

N and expand already at the end of the barrel 30E. & > 30 =E In the description in the foregoing, although some functions and elements have - been described with reference to certain features and examples, those

D functions and elements may be performable by other features and examples 2 whether described or not. Although features have been described with

R 35 reference to certain embodiments or examples, those features may also be present in other embodiments or examples whether described or not.

Above only some advantageous examples of the inventions have been described to which examples the invention is not to be narrowly limited and many modifications and alterations are possible within the invention.

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Reference signs used in the figures: 10 suppressor 11 rear end cap 12 gas turning and support frame 12A deflector surface 12B open inner space 12C support element 12D flow opening 13 suppressor housing 14 first baffle holes 16 center baffle 17 end baffle 15 18 perimeter chamber 19 rear chamber outlet opening for the projectile 21 joint between the rear end cap and the gas turning and support frame 22 rear end joint for the first baffle 20 23 joint for the center baffle 24 front end joint for the end baffle 26 direct thread for the barrel 27 reopenable attachment between the suppressor housing and the support frame 28 reopenable attachment between the suppressor housing and the rear end cap & 30 barrel opening

N 30E end of the barrel 3 34 first baffle chamber 2 30 36 center baffle chamber =E 37 end baffle chamber - S assembly direction

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Claims

1. Firearm suppressor, which suppressor (10) has a substantially rotationally symmetrical cylindrical form and comprises a suppressor housing (13), a rear end cap (11), a plurality of chambers (18, 19, 34, 36, 37) for expansion and burning of propellant gases and arranged inside the suppressor housing (13), a barrel opening (30), an outlet opening (20) for a projectile and a continuous channel along an imaginary center axis of the rotationally symmetrical cylindrical form of the suppressor (10) from the barrel opening (30) to the outlet opening (20) for the projectile configured to be fired by the firearm, characterized in that the suppressor (10) comprises a gas turning and support frame (12), that the gas turning and support frame (12) has a deflector surface (12A) configured to turn at least 50 %, advantageously 80 %, of propellant gases substantially backwards, and that the gas turning and support frame (12) has an open inner space (12B) configured to provide filling and expansion of the propellant gases.

2. Firearm suppressor according to claim 1, characterized in that the deflector surface (12A) is configured to form a curved and/or inclined and/or tapered surface at maximal area inside the gas turning and support frame (12).

3. Firearm suppressor according to claim 1 or 2, characterized in that the deflector surface (12A) is towards the back of the suppressor (10) n 25 concave and/or tapered and/or inclined. N

N 4. Firearm suppressor according to any of previous claims, characterized 3 in that the rear end cap (11) extends partially inside the gas turning 2 support frame (12). I

& 5. Firearm suppressor according to any of previous claims, characterized © 30 in that the gas turning and support frame (12) is configured to form an 2 open space (12B) and a flow opening (12D) such, that the propellant o gases fill the open space (12B) and the flow opening (12D) substantially evenly and maximally providing substantially even pressure distribution in the open space (12B) and in the flow opening (12D).

6. Firearm suppressor according to claim 5, characterized in that the firearm suppressor (10) comprises a rear chamber (19) and the propellant gases further from the open space (12B) and the flow opening (12D) are configured to expand to the rear chamber.

7. Firearm suppressor according to any of previous claims, characterized in that the gas turning and support frame (12) comprises at least one support element 12C between its outer and inner structure.

8. Firearm suppressor according to any of previous claims, characterized in that the gas turning and support frame (12) is made of titanium or of a composition of titanium.

9. Firearm suppressor according to any of previous claims, characterized in that the suppressor (10) comprises a first, at least one center and an end baffle (14, 16, 17) located between the gas turning and support frame (12) and the front end of the suppressor (10), that the first baffle (14) is joined to the gas turning and support frame (12) by a reopenable joint (22), that reopenable joints (23) attach a center baffle/-s (16) to the adjacent baffles (14, 16, 17) and that the end baffle (17) is attached to the suppressor housing (13) by a reopenable joint (24).

10. Firearm suppressor according to claim 9, characterized in that the first baffle (14) comprises flow holes (15) around its perimeter.

11. Firearm suppressor according to claim 9 or 10, characterized in that between the outer circumference of the baffles (14, 16, 17) and the inner n circumference of the suppressor housing (13) a perimeter chamber (18) S is formed. N 3 25

12. Firearm suppressor according to any of claims 9-11, characterized in 2 that the propellant gases are configured to be guided through the flow =E holes (15) to the perimeter chamber (18). a ©

13. Firearm suppressor according to any of previous claims, characterized 2 in that the gas turning and support frame (12) is a uniform structure. oo N 30

14. Firearm suppressor according to any of previous claims, characterized in that the gas turning and support frame (12) is configured to act as a receiving part for loads, stresses and strains of the suppressor (10) via its attachment (26) to the barrel (30).