RADICAL FIREARMS Complete Upper Assembly 6.5 Grendel 24" 15"MHR

Timber Creek Rifle-Length SOCOM Barrel 6.5 Grendel 18", Black

RADICAL FIREARMS Complete Upper Assembly 5.56 10.5" M4 10" RPR

RADICAL FIREARMS 223 Rem/5.56 NATO 16in Black Complete Upper Assembly (CFU16-5.56SOC-15RPR)

AERO PRECISION M4E1 Threaded Complete Upper 16" 5.56 Barrel w/ 15" M-LOK ATLAS R-ONE Handguard - BLK

AERO PRECISION M5 308 Win Assembled Upper Receiver | OD Green

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

ALEXANDER ARMS Tactical Complete Upper 6.5 Grendel 16" Blk AR-15