ADAMS ARMS P1 UPPER 5.56X45MM NATO 16" BBL MOE ADJ GAS PISTON MAGPUL MOE A2

AMERICAN TACTICAL IMPORTS Milsport RIA P3P 5.56 16" BBL 13" KM M4 Stock

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

AERO PRECISION M5 308 Assembled Upper Receiver | Kodiak Brown Anodized

AMERICAN TACTICAL IMPORTS Milsport Upper 5.56 7.5" MLOK No Handle/BCG

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