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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.
Weight Components M3 2.69 kg (5 lb 15 oz) Base charge and four incremental charges (for charges 1 to 5) M4 6.29 kg (13 lb 14 oz) Base charge and two incremental charges (for charges 5 to 7) M4A1 6.31 kg (13 lb 15 oz) Base charge and four incremental charges (for charges 3 to 7) Mk I Dummy 3.63 kg (8 lb)
The current U.S. Army and Air Force issue M4A1 carbine comes with the M68 ... 0.5-inch longer and four ounces ... 12 SPR is an 18" heavy barrel with muzzle brake and ...
The M4's 14.5" barrel length reduces muzzle velocity to about 2900 ft/s. [193] This reduced wounding ability is one reason that, despite the Army's transition to short-barrel M4s, the Marine Corps has decided to continue using the M16A4 with its 20″ barrel as the 5.56×45mm M855 is largely dependent upon high velocity to wound effectively. [44]
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.
The original 28-round magazine was designed to be the same dimensions and use the same web gear as the 30-round AR-15/M16 magazines. The larger 30-round Barrett steel magazines were an inch longer and weighed 5 ounces more (0.569 lbs. [258 grams] empty / 1.82 lbs. [0.825 kg.] full) than the standard AR-15/M16 aluminum magazine.
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 ...
The "A" assortment can (weight: 12 oz.) was packed with an assortment of a packet of six .30 Carbine M6 rifle-grenade blanks, a packet of ten .30-'06 Springfield M3 rifle-grenade blanks, and a packet of five M7 booster charges. This "all in one" assortment was the last surviving version in the 1974 Identification Listings.