BCM 4URM4 M4 Upper Assembly Multi-Caliber 7075-T6 for AR-15
Product Features & Specifications BCM 4URM4 BCM M4 Upper Assembly Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for AR-15 Bravo's BCM M4 Upper Receiver Assembly is precision machined to correct Mil-Specs from 7075 T6 forgings extension, providing the user with superior strength when dro
