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  2. 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]

  3. 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 ...

  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. Harrington & Richardson - Wikipedia

    en.wikipedia.org/wiki/Harrington_&_Richardson

    Top-Break Automatic Ejecting Model 1.32 S&W, .32 H&R, or .38 S&W; 5- or 6- shot; hard rubber grip panels with floral design, 3 + 1 ⁄ 4 in. barrel, modified American Double Action mechanism and frame, nickel finish, First Variation marked on top of barrel with company name and address only and two guide rods for ejector (1885–1886), Second ...

  6. 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 ...

  7. 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 ...

  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. M4 carbine - Wikipedia

    en.wikipedia.org/wiki/M4_carbine

    In 2002, the Block II modification kit was adopted featuring two new upper receivers: the Special Purpose Receiver (SPR) with a 16 or 18 in (406 or 457 mm) barrel and Close Quarter Battle Receiver (CQBR) with a 10.3 in (262 mm) barrel.