WINDHAM WEAPONRY SRC 7.62X39 FLATTOP UPPER KIT

CMMG Banshee Suppressed Upper 9mm 6.5" Black

CMMG Banshee Suppressed 9mm Upper Receiver Kit, 6.5"

CMMG Banshee Mk4 Suppressed Upper .300 BLK 6.5"

Timber Creek Outdoors TCO Enforcer Upper Parts Kit for AR-15, Purple Anodized - E UPK PPA

AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black

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

LBE Unlimited M4 Stripped Upper Receiver, Fits AR15, Black Finish ARSTUP