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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. IWI Carmel - Wikipedia

   en.wikipedia.org/wiki/IWI_Carmel

   The IWI Carmel is a short-stroke, gas-piston operated rifle chambered in 5.56x45mm, similar to the CZ BREN 2 and the FN SCAR-L.The free-floating barrel is chrome lined and cold hammer-forged, with a 1:7 twist rate and available in a variety of barrel lengths: 10.5", 12", 14.5" and 16".

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

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

   HBAR: A barrel that in some portion is thicker than government-profile, usually underneath the handguards; M4: Government barrel profile with small portion reduced to 0.575 inches to mount M203 grenade launcher; M4 HBAR: M4 barrel with portion under handguard thickened for sustained automatic fire; Super Heavy: Special Colt bull target/match barrel

5. Close Quarters Battle Receiver - Wikipedia

   en.wikipedia.org/wiki/Close_Quarters_Battle_Receiver

   The Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.

6. M16 rifle - Wikipedia

   en.wikipedia.org/wiki/M16_rifle

   The M16's receivers are made of 7075 aluminum alloy, its barrel, bolt, and bolt carrier of steel, and its handguards, pistol grip, and buttstock of plastics. The M16 internal piston action was derived from the original ArmaLite AR-10 and ArmaLite AR-15 actions.

7. CAR-15 - Wikipedia

   en.wikipedia.org/wiki/CAR-15

   The CAR-15 name was an attempt to re-associate the AR-15 name with Colt, since the AR initially stood for "Armalite Rifle" the original manufacturer of the Armalite AR-15. Colt later abandoned the CAR-15 concept, but continued to make carbine variations, using the "M16" brand for select-fire models and the "Colt AR-15" brand for semi-automatic ...