223 Remington Upper Receivers

Daniel Defense MK18 AR-15 Pistol Complete Upper Receiver 5.56mm NATO 10.3" Barrel Flat Dark Earth

Daniel Defense DDM4v7 S AR-15 Complete Upper Receiver 5.56x45mm NATO 11.5" Barrel

Daniel Defense DDM4v7 AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel

Daniel Defense M4A1 Block II AR-15 Complete Upper Recevier 5.56x45mm NATO 14.5" Pinned Barrel

Daniel Defense DDM4v7 Lightweight AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel

Noveske AR-15 Chainsaw Complete Upper Receiver 5.56x45mm NATO 16" Barrel NSR-15 M-LOK Handguard Black

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

SIG SAUER MCX 5.56 NATO 10.3" - FDE

AR-STONER AR-15 Pistol Complete Upper Receiver 5.56x45mm NATO 10" Barrel

Daniel Defense DD4 RIII AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel

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

AR-STONER AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel

Radian Weapons Model 1 Upper/Handguard Set 15.5

HK MR556 A4 AR-15 Complete Upper Receiver 5.56x45mm NATO 11" Barrel

Rock River Arms AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel

Faxon AR-15 ARAK-21 Complete Upper Receiver 5.56x45mm NATO 16" Barrel

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

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

HK MR556 A4 AR-15 Complete Upper Receiver 5.56x45mm NATO 16.5" Barrel

Daniel Defense M4A1 RIII AR-15 Complete Upper Recevier 5.56x45mm NATO 14.5" Pinned Barrel

Radical Firearms Complete Upper Assembly .223 Rem/5.56 16 Barrel MLOK

ZEV Technologies Stripped Forged AR-15 Upper Receiver Aluminum Matte

Spike s Tactical Generation 2 Billet Upper 223 Remington 556NATO Mil-Spec Barrel Nut

LanTac Raven Billet Receiver Set 5.56 / .223 Rem