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  2. Heckler & Koch HK33 - Wikipedia

    en.wikipedia.org/wiki/Heckler_&_Koch_HK33

    The spring-powered claw extractor is also contained inside the bolt while the lever ejector is located inside the trigger housing (actuated by the recoiling bolt). Further like the G3 the HK33 also contains a spring extractor and a buffer. The ejector lever was installed in the trigger housing and is actuated by the recoiling bolt.

  3. Parts kit - Wikipedia

    en.wikipedia.org/wiki/Parts_kit

    A parts kit is a collection of weapon (notably firearm) parts that, according to the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), "is designed to or may be readily be assembled, completed, converted, or restored to expel a projectile by the action of an explosive."

  4. Heckler & Koch HK43 - Wikipedia

    en.wikipedia.org/wiki/Heckler_&_Koch_HK43

    The standard HK93A2 utilized a fixed stock while the HK93A3 used a retractable stock. The HK93 series had a redesigned semi-automatic trigger pack and metal shelf installed in the trigger group well that made it impossible for it to fit a full-auto trigger pack. It also had the bayonet mount removed and had different furniture. [citation needed]

  5. Heckler & Koch HK21 - Wikipedia

    en.wikipedia.org/wiki/Heckler_&_Koch_HK21

    The spring-powered claw extractor is also contained inside the bolt while the lever ejector is located inside the trigger housing (actuated by the recoiling bolt). The reliable functioning of roller-delayed blowback mechanisms is limited by specific ammunition and arm parameters like bullet weight, propellant charge, barrel length and amount of ...

  6. Heckler & Koch G3 - Wikipedia

    en.wikipedia.org/wiki/Heckler_&_Koch_G3

    The spring-powered claw extractor is also contained inside the bolt while the lever ejector is located inside the trigger housing (actuated by the recoiling bolt). [ 7 ] The chamber has longitudinal gas relief flutes cut in the chamber wall to ease the cartridge case's extraction upon firing.

  7. Heckler & Koch MP5 - Wikipedia

    en.wikipedia.org/wiki/Heckler_&_Koch_MP5

    Per HK trigger group standards, most MP5 variants have the option of "SEF" or "Navy" trigger groups, with further alterations based on the availability and type of burst fire; the "SE" and "0-1" trigger groups are only available for semi-automatic and civilian variants. While the "SEF" trigger group's fire selector lever is located on the left ...

  8. Trigger (firearms) - Wikipedia

    en.wikipedia.org/wiki/Trigger_(firearms)

    Firearms use triggers to initiate the firing of a cartridge seated within the gun barrel chamber.This is accomplished by actuating a striking device through a combination of mainspring (which stores elastic energy), a trap mechanism that can hold the spring under tension, an intermediate mechanism to transmit the kinetic energy from the spring releasing, and a firing pin to eventually strike ...

  9. Heckler & Koch VP9 - Wikipedia

    en.wikipedia.org/wiki/Heckler_&_Koch_VP9

    The VP9 trigger has a short, light take-up with a solid, single action type break followed by a short positive reset. The average weight of the stock trigger pull is 5.2 lb f (23 N). The VP9 trigger has a consistent pre-travel pull followed by a positive set with clean break. Disassembly does not involve releasing the striker by squeezing the ...