Low prices on the Colt AR-15: 6940 M4 Carbine with Quad Rail .223 / 5.56 start at Champion Firearms- Colt is a leading designer, developer and manufacturer of small arms and weapons systems for the U.S. Military, its allies and federal, state and local law enforcement agencies. The Colt M4 CAR-15 is a well-conceived and well-executed rifle, with exemplary accuracy and reliability. The Colt M4 is a lightweight, robust patrol or defense rifle that feels balanced with the stock fully extended or collapsed.
The 1:7-inch twist of the barrel and 5.56x45 mm NATO chamber allow the use of 55-grain, 62-grain and 77-grain ammunition. The M4-style barrel measures 0.750 inches at the gas block, but decreases to 0.640 inches under the handguard, and incorporates the M4-style step. Barrel attachment is by way of an improved barrel nut that offers greater strength.
The Colt M4 has a chrome-lined barrel, four-position collapsible stock, and birdcage-style flash hider. Also present are the familiar shell deflector, ejection port cover and forward assist. The Colt M4's bolt, carrier and trigger mechanism also follow the proven AR-15 pattern, as do the controls on the lower receiver: magazine release, reversible safety and bolt release. Like all current Colt-produced rifles, the M4 uses 0.154-inch-diameter hammer and trigger pins. Both upper and lower receivers are made from a CNC-machined 7075-T6 Aluminum Forging.