5.56x45mm NATO Upper Receivers

TacFire AR-15 .223 / 5.56 Unassembled Upper Receiver Kit - 14.5"

FOSTECH STEALTH BUILDERS KIT STRIPPED UPPER LOWER AND MACH-4 15IN RAIL MATCHED SET OD GREEN

Guntec USA AR-15 5.56 Complete Ultralight Series Pistol Kit No Lower Red

Guntec USA AR-15 5.56 Complete Ultralight Series Pistol Kit No Lower Black

X PRODUCTS 5.56/9mm Billet Assembled Side Charging Upper Blk

Anderson's 5.56 BR Complete Upper Low profile gas block

Guntec USA AR-15 Upper Receiver Assembly Kit Trap Door Assembly Cerakote Flat Dark Earth

Black Rain Ordnance Milled Upper Receiver AR-15 5.56x45mm NATO Right Hand Black

Black Rain Ordnance Complete Upper Competition 3G 16in Black

Black Rain Ordnance Complete Upper Scout 5.56 Black

Black Rain Ordnance Spec 15 Complete Upper Black

Black Rain Ordnance SPEC15, 5.56mm, 10.5 Barrel, 12 Handguard, Suppressor Ready Complete Upper Receiver

ANDERSON AR15 S 5.56 NATO Complete Upper Receiver w/ Bolt Carrier Group & Charging Handle - Black

BLACK RAIN FALLOUT 15

BLACK RAIN ORDNANCE Spec15 Forged Alum Upper Recv 16" 4150 Gas Barrel

Maxim Defense Industries MDX 505 PDX/SCW Compatible URG Upper Receiver 5.56 NATO Hate Brake 1/2-28 Thread 5.5in Barrel Arid Earth

Anderson Manufacturing AM-15 Utility 5.56mm Complete Upper Receiver with 14.5 Inch Barrel

Anderson Manufacturing Utility 5.56mm Complete AR-15 Upper Receiver with 7.5 Inch Barrel

Sons of Liberty Gun Works SOLGW Patrol SL 5.56mm 13.9" No BCG/CH Upper Half w/SF Compatible/ROTEX Mount PATROLSLUPPER-13.9-556-SF

Sons of Liberty Gun Works SOLGW Patrol SL 5.56mm 11.5" No BCG/CH Upper Half w/HUXWRX Mount PATROLSLUPPER-13.9-556-XL

Sons of Liberty Gun Works SOLGW EXO3 5.56mm 13.9" No BCG/CH Upper Receiver w/HUXWRX Mount EXO3UPPER-13.7-556-XL

Sons of Liberty Gun Works SOLGW Patrol SL 5.56mm 13.9" No Muzzle Device, No BCG/CH Upper Half PATROLSLUPPER-13.9-556-NMD

Sons of Liberty Gun Works SOLGW M4-L89 Broadsword 5.56mm 14.5" No Muzzle Device No BCG/CH Upper Receiver M4L89BSUPPER-14.5-556-NMD

Sons of Liberty Gun Works SOLGW M4-L89 5.56mm 12.5"Bbl Broadsword Upper SBR M4-L89BS-SBR-12.5