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  2. Lewis Machine & Tool Company - Wikipedia

    en.wikipedia.org/wiki/Lewis_Machine_&_Tool_Company

    A patented AR-15-pattern is produced with a bolt design featuring a redesigned extractor intended to improve the extraction of cartridges under adverse conditions. The company also produces a redesigned bolt carrier intended to improve the reliable performance of the rifle's “internal piston” system by obtaining a similar timing sequence with 14.5-inch carbine-length barrels compared to 20 ...

  3. Robinson Armament M96 Expeditionary - Wikipedia

    en.wikipedia.org/wiki/Robinson_Armament_M96...

    It's chambered for the .223 Remington/5.56 mm NATO cartridge, and uses STANAG 4179 AR-15 magazines. Barrels have 1-in-9 twist ratio as is common for .223 Remington semiautomatic rifles. The M96 is gas operated, with a fixed gas cylinder and moving piston connected to the operating rod and bolt carrier. All variants are equipped with a gas ...

  4. Eugene Stoner - Wikipedia

    en.wikipedia.org/wiki/Eugene_Stoner

    The Stoner bolt and carrier piston system is a widely known gas system designed by Eugene Stoner. The patent for the gas operated bolt and carrier system was filed in 1956 by ArmaLite for use in the AR-10, which was later developed into the ArmaLite AR-15, M16 rifle and M4 carbine.

  5. List of AR platform cartridges - Wikipedia

    en.wikipedia.org/wiki/List_of_AR_platform_cartridges

    The resulting COAL of 2.300" is only 1.02 mm longer than the maximum COAL for chambering a cartridge in the smaller AR-15; however, the 45 Raptor chamber pressure is allowed to be as high as 62,000 PSI. This means that the stronger AR-10 receiver and bolt carrier group is needed for shooting this cartridge.

  6. 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.

  7. AR-15–style rifle - Wikipedia

    en.wikipedia.org/wiki/AR-15–style_rifle

    American Tactical OMNI AR-15–style rifle (lower in polymer), 5.56×45mm NATO caliber, with Millett DMS-1 scope and FAB Defense stock and grips. In the 1990s, sales of AR-15–style rifles increased dramatically, partly as a result of the introduction of the flat top upper receiver (M4 variant) which allowed scopes and sighting devices to be ...

  8. Colt AR-15 - Wikipedia

    en.wikipedia.org/wiki/Colt_AR-15

    The AR-15 uses an L-type flip, aperture rear sight and it is adjustable with two settings, 0 to 300 meters and 300 to 400 meters. [16] The front sight is a post adjustable for elevation. The rear sight can be adjusted for windage. The sights can be adjusted with a bullet tip or pointed tool. The AR-15 can also mount a scope on the carrying handle.

  9. ArmaLite AR-15 - Wikipedia

    en.wikipedia.org/wiki/Armalite_AR-15

    The AR-15's upper receiver incorporates the fore stock, the charging handle, the gas operating system, the barrel, the bolt and bolt carrier assembly. The lower receiver incorporates the magazine well, the pistol grip and the buttstock.