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  2. Direct impingement - Wikipedia

    en.wikipedia.org/wiki/Direct_impingement

    Firearms with a direct impingement design can, in principle, be constructed lighter than piston-operated designs. Because high-pressure gas acts directly upon the bolt and carrier in a direct impingement system, it does not need a separate gas cylinder, piston, and operating rod assembly of a conventional piston-operated system, only requiring a gas tube to channel gas from the barrel back ...

  3. Action (firearms) - Wikipedia

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

    There are three basic types: long stroke gas piston (where the gas piston goes the same distance as the operating stroke of the action parts, and is often attached to the action parts), short stroke gas piston (where the gas piston travels a shorter distance than the operating stroke of the action parts), and direct impingement (AKA "direct gas ...

  4. Gas-operated reloading - Wikipedia

    en.wikipedia.org/wiki/Gas-operated_reloading

    short-stroke gas piston Short stroke gas piston and bolt carrier group, from a gas piston AR-15. With a short-stroke or tappet system, the piston moves separately from the bolt group. It may directly push [12] the bolt group parts, as in the M1 carbine, or operate through a connecting rod or assembly, as in the Armalite AR-18 or the SKS.

  5. Ruger SR-556 - Wikipedia

    en.wikipedia.org/wiki/Ruger_SR-556

    The rifle features a short-stroke piston mechanism as opposed to the semi-direct impingement system of the AR-15. Gas flow is controlled by a four position regulator. Several key parts, such as the gas piston, gas regulator, and bolt/carrier group are chrome plated. The bolt carrier features an integral lug in place of the AR-15's gas key.

  6. Eugene Stoner - Wikipedia

    en.wikipedia.org/wiki/Eugene_Stoner

    It is commonly called a direct impingement system, but it does not utilize a conventional direct impingement system. In U.S. patent 2,951,424, the designer states: ″This invention is a true expanding gas system instead of the conventional impinging gas system.″ Gas is routed from a port in the barrel through a gas tube, directly to a ...

  7. PVAR rifle - Wikipedia

    en.wikipedia.org/wiki/PVAR_rifle

    UDMC PVAR rifles are Filipino variants of the Armalite AR-15 and AR-10, using the Pneumatic Valve and Rod system manufactured by United Defense Manufacturing Corporation.. The Pneumatic Valve and Rod system was created to be a more reliable alternative to the Stoner bolt and carrier piston system used in the AR-15 family, commonly but incorrectly referred to as a direct impingement system.

  8. Colt IAR6940 - Wikipedia

    en.wikipedia.org/wiki/Colt_IAR6940

    The IAR6940 is gas-operated and air‐cooled, fed by box magazines such as the STANAG and Drum magazines. It is chambered in 5.56×45mm NATO and is based on the M16 rifle/M4 carbine. Similar to the CAR-15, from which it shares many fundamental features, the IAR6940 uses a direct impingement system rather than a gas

  9. Barrett REC7 - Wikipedia

    en.wikipedia.org/wiki/Barrett_REC7

    The goal of the Industry Day was to review current carbine technology prior to writing formal requirements for a future replacement for the M4 carbine. The Barrett Enhanced Bolt is made from high-strength 9310 steel. The bolt is designed specifically for use in the piston operated REC7, not just adapted from a direct gas bolt.