DealThis incredible complete 300 Blackout upper receiver features Aero Precision's M4E1 threaded upper and new 7" Gen 2 Enhanced Keymod Handguard! Key features include the addition of quick disconnect sling sockets, enhanced milling design for grip and visual appeal and a new profile for the picatinny top rail. from Ground Zero Precision (Product aero-8-fde-300blk-upper) |