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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. Colt AR-15 - Wikipedia

    en.wikipedia.org/wiki/Colt_AR-15

    Most components are interchangeable between semi-auto and select fire rifles including magazines, sights, upper receiver, barrels and accessories. [2] [20] The military M4 carbine typically uses a 14.5-inch (370 mm) barrel. Civilian rifles commonly have 16-inch or longer barrels to comply with the National Firearms Act. [21]

  4. 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]

  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

    The first prototype was essentially an M16E1/M16A1 rifle with 5 inches of the barrel removed resulting is a barrel 15 inches (381 mm) in length, so that it ended just forward of the front sight base. Because of the shorter barrel and no space to attach a bayonet, the bayonet mounting lugs removed. Due to the shortened barrel with the gas port ...

  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.

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