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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. Colt Canada C7 and C8 - Wikipedia

    en.wikipedia.org/wiki/Colt_Canada_C7_and_C8

    The C8FTHB was quickly replaced by the C8A3, which features the same 400 mm (15.7 in) cold-hammer forged barrel and flat-top upper receiver as the C8FTHB as well as all the mid-life upgrades that appeared on the C7A2 such as the green furniture, ambidextrous charging-handle latch, magazine release and selector lever.

  8. .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.

  9. 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.