Spikes Tactical Gadsden Lower/Upper Receiver Set, Semi-automatic, 223 Remington/556NATO, Cerakote Finish, Flat Dark Earth, Includes 9 in SAR3 Rail STS1634-PFD9

Radian Weapons Model 1 10" Upper Receiver and Handguard Set, Flat Dark Earth

SPIKES TACTICAL Complete Upper 5.56x45 16" Black Mid-length AR15

Spikes STR5035R9S ST-15 LE Mid-Length 223 Rem,5.56x45mm NATO 16" No Magazine Black Hard Coat Anodized 6 Position Stock

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

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

Radian Weapons R0027 Complete Upper 300 Blackout 9" Black Barrel, 7075-T6 Aluminum Radian Black Receiver, Extended with Magpul M-LOK Handguard for AR-15

AERO PRECISION M5 AR10 Carbine Complete Lower Receiver w/ A2 Grip - Black