Colt M4 CQB 10.3" with Fixed Front Sight

Each Colt AR-15 M4CQB Barrel features six-groove rifling with a 1:7-inch rate of twist. The barrels include M4-style feed ramps and have a chrome lining that prevents corrosion. Each barrel is set up for a carbine-length gas system and features 1/2""-28 TPI threading at the muzzle.
 
Includes both the front sight post as well as a factory colt barrel nut.