Built to the correct Mil-Specs (Inside Diameter for barrel extension slightly undersized for a tighter fit to the barrel and a more accurate rifle. Please use a heat gun or hair dryer to warm up threaded bore of receiver if barrel extension is too tight.)

•Precision machined to correct Mil-Specs from 7075 T6 Forgings extension, providing the user with superior strength when dropped or when mortaring malfunction clearance drills.
•Fully Assembled with forward assist, and ejection port cover
•Mil-Std 1913 Rail for mounting optics and accessories
•Machined for use with barrels that use an M4 barrel extension
•Laser etched T-markings for addressing the remounting of optics
•Includes Mil-Spec Forward Assist with heat treated tool steel pawl, with press fit and pinned cap
•Hard Coat Anodized per Mil-A-8625F, Type III, Class2
•Dry Film Lube on interior bore per Mil-Specs
•As with all BCM® products, Made in the U.S.A.