Blow-forward is a

firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined further in different countries (see Legal definitions). The first firearms originated in 10th-century China, when bamboo tubes ...

action Action may refer to: * Action (narrative), a literary mode * Action fiction, a type of genre fiction * Action game, a genre of video game Film * Action film, a genre of film * ''Action'' (1921 film), a film by John Ford * ''Action'' (1980 fil ...

where the

propellant A propellant (or propellent) is a mass that is expelled or expanded in such a way as to create a thrust or other motive force in accordance with Newton's third law of motion, and "propel" a vehicle, projectile, or fluid payload. In vehicles, the e ...

gas pressure In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas as if it alone occupied the entire volume of the original mixture at the same temperature. The total pressure of an ideal ...

and the

friction Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: *Dry friction is a force that opposes the relative lateral motion of t ...

of the

bullet A bullet is a kinetic projectile, a component of firearm ammunition that is shot from a gun barrel. Bullets are made of a variety of materials, such as copper, lead, steel, polymer, rubber and even wax. Bullets are made in various shapes and ...

traveling down the bore drag the whole

gun barrel A gun barrel is a crucial part of gun-type weapons such as small firearms, artillery pieces, and air guns. It is the straight shooting tube, usually made of rigid high-strength metal, through which a contained rapid expansion of high-pressure ...

forward to facilitate the opening of the breech. This forward barrel motion provides most of the energy required to eject a spent

cartridge case A cartridge or a round is a type of pre-assembled firearm ammunition packaging a projectile (bullet, shot, or slug), a propellant substance (usually either smokeless powder or black powder) and an ignition device ( primer) within a metallic, ...

and chamber a fresh round of

ammunition Ammunition (informally ammo) is the material fired, scattered, dropped, or detonated from any weapon or weapon system. Ammunition is both expendable weapons (e.g., bombs, missiles, grenades, land mines) and the component parts of other weap ...

, and contains a minimum of moving parts, and thus is more compact than other operating mechanisms of equal barrel length.

Description

The vast majority of

repeating firearm A repeating firearm or repeater is any firearm (either a handgun or long gun) that is capable of being fired repeatedly before having to manually reload new ammunition into the weapon. Unlike single-shot firearms, which can only hold and fire ...

s have their barrel fixed to the receiver or largely immobile in relation to the frame, with the breech face (as part of a moving bolt or slide) moving within the frame against the barrel. In contrast, the frame of a blow-forward firearm incorporates a fixed breech face, with the barrel being mobile and sliding away from the breech (frame) during the weapon's cycling. Due to the reduced mass of rearward-traveling parts coupled with the increased mass of the forward moving parts (barrel in addition to bullet and propellant gasses), recoil energy is significantly greater than other operating mechanisms. The barrel and spring are generally the only moving parts. Most blow-forward guns rely partially on the inertia of the barrel as the rest of the firearm recoil away from it.

Examples

The first blow-forward firearm was the Mannlicher M1894 pistol and protected under . The principle has been used in a few other weapons, including: *

Schwarzlose Model 1908 The Schwarzlose Model 1908 was a semi-automatic pistol, designed by Andreas Schwarzlose, released in 1908 in the German Empire and produced until 1911. Operation The Schwarzlose employs a very distinctive "blow-forward action" operating m ...

* Hino Komuro M1908 Pistol * Mk 20 Mod 0 40mm automatic grenade launcher. For a list of blow-forward firearms, see List of blow-forward firearms

References

External links

How Does it Work: Blow Forward
Forgotten Weapons {{DEFAULTSORT:Blow Forward Firearm actions Firearm terminology ja:ブローバック#ブローフォワード方式

Description

Examples

See also

References

External links