This M4-Contour AR-15 Barrel is fully chambered and ready for installation onto a host upper receiver. The barrel features a true 5.56x45mm NATO Chamber for use with both commercial and military surplus ammunition, while the 1 in 7" Twist Rifling is capable of stabilizing light to medium weight projectiles of up to about 69 grains. The barrel's M4 Contour sheds excess weight and bulk, and comes complete with the military standard M203 cut. This barrel is an excellent choice for a general purpose AR rifle build that's perfectly suited for use at the range, in a 3-Gun match, or in the field pursuing game. Barrel extension, and locator pin are included and factory installed.
14.5" M4 profile 5.56x45
Material: 4150 Heat-treated Gun quality steel
Muzzle: ½ x 28 thread Gasport: .073
Twist Rate: 1/7
M4 feed ramps
Carbine Length Gas System
Barrel weight is : 2 Pounds 3 ounces