PSA Gen4 4" 9mm 6" Lightweight Hex M-Lok Railed Upper - With BCG & CH

AR-STONER AR-15 Complete Upper Receiver 45 ACP 16" Barrel

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

AR-STONER AR-15 Complete Upper Receiver 300 Blackout 16" Barrel

Angstadt Arms AR-15 Complete 9mm Upper Assembly 6 Barrel

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

Battle Arms Workhorse AR-15 Pistol Barreled Upper Receiver 5.56x45mm NATO 9.5" Barrel

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