BCM AR-15 M4 Upper Receiver Assembly Flat Top – Aluminum- Black

Forged aluminum flattop receiver includes fully-assembled forward assist and ejection port cover and accepts barrels with M4 barrel extensions. All final dimensions machined to correct mil-spec tolerances to readily accept standard AR-15 parts to help you complete an upper receiver. Laser-etched T-marks on Picatinny rail enable easy removal and re-mounting of optics, sights, and other accessories in the correct position. Interior has dry film lubrication to help reduce wear. 

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

Features:

• 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
• Made in the U.S.A.