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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. Ruger AR-556 - Wikipedia

    en.wikipedia.org/wiki/Ruger_AR-556

    The Ruger AR-556 is a semiautomatic AR-15 style rifle manufactured by U.S. firearms company Sturm, Ruger & Co. Introduced in 2014 as an entry-level AR-15 using a direct impingement action, with variants since being released such as the upgraded AR-556 MPR (multi-purpose rifle) in 2017 [1] and the AR-556 pistol in 2019.

  4. SIG Sauer SIGM400 - Wikipedia

    en.wikipedia.org/wiki/SIG_Sauer_SIGM400

    The SIGM400 is a family of firearms manufactured by SIG Sauer. [1] The M400 is an air-cooled, direct impingement gas-operated, magazine-fed carbine that is based on the earlier AR-15 rifle. [2] Depending on the variant, it can be chambered for 5.56×45mm NATO or .300 AAC Blackout cartridges, and may have a fixed or telescoping stock. [3]

  5. Gas-operated reloading - Wikipedia

    en.wikipedia.org/wiki/Gas-operated_reloading

    direct impingement. The direct impingement (DI) method of operation vents gas from partway down the barrel through a tube to the working parts of a rifle where they directly impinge on the bolt carrier. This results in a simpler, lighter mechanism. Firearms that use this system include the French MAS-40 from 1940, the Swedish Ag m/42 from 1942.

  6. LVOA - Wikipedia

    en.wikipedia.org/wiki/LVOA

    The LVOA-C is a direct gas-impingement (DGI) operated rifle based on the Colt AR-15. It features a proprietary full-length fore-end with an integrated muzzle brake/flash suppressor, which prevents the use of a suppressor due to size constraints. The rifle is used for close-quarters combat with low visibility operation applications (LVOA).

  7. Remington R4 - Wikipedia

    en.wikipedia.org/wiki/Remington_R4

    Remington Arms Company Government ... Gas-operated, direct impingement [4] The Remington R4 is a firearms platform based on the AR-15/M16/M4/M4A1 series designed and ...

  8. Ruger SR-556 - Wikipedia

    en.wikipedia.org/wiki/Ruger_SR-556

    Ruger products are usually known for affordability, but the SR-556 is essentially a regular AR-15, but with a piston operated gas system instead of the standard direct impingement system . It differs from the less expensive alternatives like the Smith & Wesson M&P15 Sport and Sport II model rifles, of which the original Sport model lacked a ...

  9. 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