5.56x45mm NATO Receivers

Luth-AR 11.50" Classic Upper 5.56x45mm 1:7 Carbine-Length w/BCG&CH, Black

ARMASPEC S3 ENHANCED TRIGGER GUARD RED

Grey Ghost Precision Stripped AR-15 Upper Receiver Aluminum Black

Sharps Bros AR-15 Complete Upper Receiver 223 Remington (Wylde) 16" Barrel

Knight's Armament Company SR-15 KS-2, 5.56mm, 14.5 Barrel, Upper Receiver Kit

AERO PRECISION AR15 Assembled Upper Receiver (No Forward Assist) | Anodized Black

Sons of Liberty Gun Works East India 5.56mm NATO 16'' Upper Receiver

FN FN15 AR-15 Complete Upper Receiver 5.56x45mm NATO 20" Barrel

Aero Precision Standard Upper Receiver Assembled AR-15 Aluminum Kodiak Brown

M4e1 Enhanced 5.56 Nato Assembled Upper Receiver For Ar-15 - M4e1 Enhanced 5.56mm Assembled Upper Receiver For Ar-15 Odg

Aero Precision M4E1 Standard Stripped AR-15 Upper Receiver No Forward Assist Flat Dark Earth

M4e1 5.56mm Assembled Upper Receiver W/Atlas R-One Handguard - M4e1 5.56mm Assembled Upper M4 10.5''''bbl Carbine Threaded Fde

M4e1 5.56 Assembled Upper Receiver W/M-Lok Atlas S-One Handguard - M4e1 5.56 Assm Uppr 18'''' Rifle 12'''' Atlas S-One Hg Blk

Sr-15 Ks-1 5.56 Nato Assembled Upper Receiver - Sr-15 Ks-1 5.56 Nato 13.7'''' Bbl Assembled Upper Rcvr Black

M4e1 Assembled Upper Receiver 7.5'''' 5.56mm Pistol Length - M4e1 Assembled Gen 2 Upper Receiver 7.5 Pistol Length

AERO PRECISION AR15 Stripped Upper Receiver (No Forward Assist) | Anodized Black

LMT MRP-L M-LOK 7.3" Monolithic Upper Receiver

TROY A3 COMPLETE UPPR 556 16"

Luth-AR M4 SOCOM Barrel Assembly 5.56 14.5 Barrel

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

Colt Firearms M4 Stripped 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