BCA ambidextrous side charging flat top upper receiver is a perfect start for your AR build, if you are looking for a unique and ergonomic build then this upper receiver is the perfect foundation. Made from 7075 aircraft aluminum, these anodized billet uppers will stand up to abuse these rifles are known to take. This product will line up with standard mil-spec lower receivers. Does not include side charging handle (SKU: SCHA-15) or receiver plug (SKU: BS-SC15)