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  2. List of Colt AR-15 and M16 rifle variants - Wikipedia

    en.wikipedia.org/wiki/List_of_Colt_AR-15_and_M16...

    Government-specified barrel profile increased to between 0.675 and 0.575 inches; A2: Also referred to as the "government" or "gov't" profile. Barrel profile for which the portion of the barrel in front of handguards is thickened to 0.715 inches; HBAR: A barrel that in some portion is thicker than government-profile, usually underneath the ...

  3. Bushmaster XM-15 - Wikipedia

    en.wikipedia.org/wiki/Bushmaster_XM-15

    The standard XM-15 has a forged 7075T6 aircraft-grade aluminum upper and lower receiver. Barrels of XM-15 firearms have a heavy profile and are hard chrome-lined 4150 alloy steel or 416 stainless steel. [2] [4] In Bushmaster's 2016 sales brochure, all new-production XM-15s are stated to be supplied with a 4150 steel barrel. [5]

  4. Colt AR-15 - Wikipedia

    en.wikipedia.org/wiki/Colt_AR-15

    The Colt AR-15 is a product line of magazine-fed, gas-operated, autoloading rifle manufactured by Colt's Manufacturing Company ("Colt") in many configurations. [1] The rifle is a derivative of its predecessor, the lightweight ArmaLite AR-15, an automatic rifle designed by Eugene Stoner and other engineers at ArmaLite in 1956.

  5. AR-15–style rifle - Wikipedia

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

    These upper receiver groups may have differing barrel lengths and sights and may fire different cartridges. A hunter with a single lower receiver might have one upper receiver with a .223 Remington barrel and telescopic sight for varmint hunting in the open country and another upper receiver with a .458 SOCOM barrel and iron sights for big-game ...

  6. CAR-15 - Wikipedia

    en.wikipedia.org/wiki/CAR-15

    A semi-auto Bushmaster Dissipator barrel which uses a similar short-barrel, standard length hand-guard concept to the CAR-15 Carbine. The Model 605 CAR-15 Carbine was a shortened version of the of Colt's M16E1/M16A1 for situations where longer weapons could be unwieldy, such as inside armored vehicles, ships/boats, or helicopters. There were ...

  7. .450 Bushmaster - Wikipedia

    en.wikipedia.org/wiki/.450_Bushmaster

    The .450 Bushmaster is descended from the Thumper concept popularized by the gun writer Jeff Cooper.Cooper was dissatisfied with the small-diameter 5.56×45mm NATO (.223 Remington) of the AR-15, and envisioned a need for a large bore (.44 cal or greater) cartridge in a semi-automatic rifle to provide one-shot kills on big-game animals at 250 yards.

  8. 5.56×45mm NATO - Wikipedia

    en.wikipedia.org/wiki/5.56×45mm_NATO

    These barrels are also available with rifling ranging from 356 mm (1-in-14") to 178 mm (1-in-7"). US makers are moving toward 5.56×45mm NATO and 178 mm (1-in-7"), which will ensure the least liability. [25] Those chambered for .223 Remington may not have a fast enough rifling to stabilize the longer 5.56×45mm NATO bullets which range up to 77 gr.

  9. 14-inch/45-caliber gun - Wikipedia

    en.wikipedia.org/wiki/14-inch/45-caliber_gun

    All guns employed a Welin breech block and used a Smith-Asbury mechanism, and, in the case of the Mark 12, chromium plating was introduced to prolong barrel life. These improvements enabled the guns to fire heavier 1,500 lb (680 kg) shells, and increasing the gun mount elevation to 30 degrees [ 2 ] extended the range of the guns to 36,000 yd ...