Harrington & Richardson BLEM 604 "Air Force" Complete Upper, 1/12, Black

CMMG Resolute Mk4 AR-15 Complete Upper Receiver 350 Legend 16.1" Barrel

Spike s Tactical 16-inch AR-15 Complete Upper 5.56 NATO M4 LE with 9-inch Rail

Spikes Tactical ST-15 Enhanced Mid-Length Complete Upper 5.56 / .223 Rem 16-inch CHF

Rise Armament Compete Upper Grey .22 ARC 18 Barrel

Battle Arms Development Workhorse AR-15 Upper 16 Barrel 5.56 NATO 15 M-LOK Handguard

CMMG Resolute Mk4 AR-15 Complete Upper Receiver 6mm ARC 16" Barrel

Nordic Components 22RB AR-15 Complete Upper Receiver 22 Long Rifle 16" Barrel