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  2. Barrett REC7 - Wikipedia

    en.wikipedia.org/wiki/Barrett_REC7

    It is an M4 carbine utilizing a short-stroke gas piston system and is available in either 5.56×45mm NATO or 6.8mm Remington SPC. The REC7 is Barrett's second AR-pattern rifle chambered for the 6.8mm Remington SPC cartridge, the first being the Barrett M468 rifle. The 6.8 SPC-chambered M468 rifle employed the same Stoner expanding gas system as ...

  3. Feed ramp - Wikipedia

    en.wikipedia.org/wiki/Feed_ramp

    The feed ramp may be part of the magazine , part of the receiver or frame , part of the barrel or part of the barrel nut/locking lugs . Some firearms, like the FN Five-seven, have a beveled chamber instead of a feed ramp. The feed ramp is a critical part of semi-automatic firearms and automatic firearms. When the weapon is fired and the spent ...

  4. Bushmaster M4-type Carbine - Wikipedia

    en.wikipedia.org/wiki/Bushmaster_M4-type_Carbine

    There is also a military M4 Type Carbine which comes with a 14.5 in (370 mm) barrel and a removable "bird cage" flash suppressor. [5] An M4 Type Post-Ban Carbine was developed for the 1994 United States Federal Assault Weapons Ban requirements. Since the ban expired in 2004, this rifle has essentially been replaced by the M4A2 and M4A3.

  5. M4 carbine - Wikipedia

    en.wikipedia.org/wiki/M4_carbine

    The M4-M4A1 conversion increases weapon weight from 7.46 lb (3.38 kg) to 7.74 lb (3.51 kg), counting a back-up iron sight, forward pistol grip, empty magazine, and sling. Each carbine upgrade costs $240 per rifle, for a total cost of $120 million for half a million conversions.

  6. Barrett M468 - Wikipedia

    en.wikipedia.org/wiki/Barrett_M468

    The Barrett M468 was a variant of the M4 Carbine, rechambered for a heavier and larger 6.8mm bullet for increased terminal performance. The designation of M468 stands for an M4 carbine chambered for the 6.8mm SPC cartridge.

  7. Squad Designated Marksman Rifle - Wikipedia

    en.wikipedia.org/wiki/Squad_Designated_Marksman...

    All rifles were equipped with a fixed A2 stock and a Knight's Armament Company 2-stage match grade trigger The upper receivers were flat top style, but unlike the SAM-R and SPR, they did not have extended feed ramps. Barrel: The 1:7 twist, 20-inch (510 mm) barrel from the M16A2 and A4 were replaced with a stainless steel Douglas Barrels 1:8 ...

  8. SOPMOD - Wikipedia

    en.wikipedia.org/wiki/SOPMOD

    The Special Operations Peculiar MODification (SOPMOD) kit is an accessory system for the M4A1 carbine, CQBR, FN SCAR Mk 16/17, HK416 and other weapons used by United States Special Operations Command (USSOCOM) special forces units, though it is not specific to SOCOM.

  9. PVAR rifle - Wikipedia

    en.wikipedia.org/wiki/PVAR_rifle

    The “F-series” models are fully automatic, and “S-series” rifles are semi-automatic. The PVAR system is offered as F5/S5 variants of the M16 and M4 in 5.56 NATO with barrel lengths from 7.5" and 22", and also available as F7/S7 variants of the M110 in 7.62×51mm with barrels starting at 14.5" up to 25". Three barrel types are available ...