Bravo Company Manufacturing MK2 Barreled AR-15 Upper Receiver - 5.56 - 11.5" - MCMR-10

AERO PRECISION AC-15M RIFLE - 5.56 NATO 16" BBL BLACK

ALEXANDER UPPER RECEIVER AR15 - PISTOL 50 BEOWULF 12" TB BLK

BATTLE ARMS Authority ELite Upper Recv 5.56 10.5" AR-15 Gray

BATTLE ARMS Workhorse Upper Recv 5.56 16" AR-15 Sniper Gray

Spikes Tactical Complete Upper Receiver, 223 Rem/556NATO, 14.5 in Barrel (16 in OAL with Pinned Brake), Mid-length Gas System, Fits AR Rifles, Black, Flat Top Receiver, No Sights, 12 in CRR Quad Rail, Dynacomp Muzzle Brake, No Mags STU5050-CQ2D

WATCHTOWER TYPE 15M COMP. UPPER .223 WYLDE 16" BLACK

BUSHMASTER M4 Type Patrolman Flat Top A4 Upper 5.56 16" Black