5.56x45mm NATO Upper Receivers

American Tactical MilSport Complete Upper 5.56 / .223 Rem 7.5 Threaded Barrel

Geissele Automatics Geissele Super Duty 5.56mm 14.5" Heavy Bbl (.750 Journal) DDC Stripped Upper Receiver (No Charging Handle, Muzzle Device, or BCG)

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 16" HBAR Barrel M-LOK Desert Dirt

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 16" HBAR Barrel M-LOK Black

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 14.5" Pinned and Welded Heavy Barrel M-LOK Desert Dirt

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 14.5" Pinned and Welded Heavy Barrel M-LOK Black

BATTLE ARMS Workhorse Upper Recv 5.56 16" AR-15 Sniper Gray

Wilson Combat Upper Receiver 5.56x45mm NATO AR-15 Forged Anodized Black

Mcx-Spear Lt Ar Conversion Kit 5.56 Nato - Mcx-Spear Lt Ar Conversion Kit 5.56 Nato 11.5'''' Black

Sons of Liberty Gun Works SOLGW EXO3 5.56mm 16" No BCG/CH Upper Receiver EXO3UPPER-16-556

Sons of Liberty Gun Works SOLGW EXO3 5.56mm 11.5" No BCG/CH Upper Receiver EXO3UPPER-11.5-556

Sons of Liberty Gun Works SOLGW Patrol SL 5.56mm 16" No BCG/CH Upper Half PATROLSLUPPER-16-556

Guntec USA AR-15 Stripped Billet Upper Receiver Flat Dark Earth

Sons of Liberty Gun Works East India Starter Kit Upper 5.56 11.5 Threaded Barrel

LANTAC PDP Complete Upper Receiver 223Wylde 7.5 AR-15 Blk

BUSHMASTER M4 Type Patrolman Flat Top A4 Upper 5.56 16" Black

Colt Firearms M4 Stripped Upper 5.56 16.1 Barrel

Colt Firearms LE6933EPRII PRO Complete Upper 5.56 11.5 Threaded Barrel

Colt Firearms LE6920EPRII Complete Upper 5.56 16.1 Barrel

Colt AR-15 Complete Upper Receiver 5.56x45mm NATO 20" Barrel Magpul MOE Handguard

Colt Firearms LE6921CK-NHG Upper Kit Black 5.56 NATO 14.5-inch

PRI Mark 12 Mod 0 AR-15 Complete Upper Receiver 5.56x45mm NATO 18" Barrel 1:7" Twist Black

PRI Mark 12 Mod H AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel 1:7" Twist Black

WMD Guns Upper Receiver Nib-X 5.56 Stripped Upper