9mm/.45ACP AR-9 Slick Side Billet Upper Receiver
9mm/.45ACP AR-9 Slick Side Billet Upper Receiver, Quality, American made slick-side upper designed to be used in 9mm or .45ACP PCC (pistol caliber carbine) builds. Unique design and fashioned out of a single block of billet aluminum, this upper receiver is strong enough to last. No feedramps Compatible with most mil-spec forged or billet lower receivers .250 pivot pin holes No forward assist