5.56x45mm NATO Gun Parts

Aero Precision M4E1 AR15 5.56mm 8in M-LOK Threaded Upper Receiver Pistol Length 1-7 Twist 1/2x28 A2 Flash Hider 7.3in M-LOK R-ONE Handguard Cerakote

Aero Precision M4E1 Threaded Complete Upper 7.5in 5.56 Barrel ATLAS R-ONE 7in M-LOK HG Anodized Black

Aero Precision AR-15 Complete Upper Receiver 5.56 Carbine Length 10.5 inch Barrel w/Pinned FSB Magpul MOE Handguard A2 Flash Hider Anodized Black

Aero Precision AR-15 Complete Upper Receiver 5.56 Carbine Length 16 inch Barrel w/Pinned FSB Magpul MOE Handguard A2 Flash Hider Anodized Black

Aero Precision AR-15 Complete Upper Receiver 5.56 Rifle Length 20 inch Barrel w/Pinned FSB Magpul MOE Handguard A2 Flash Hider FDE Cerakote

Aero Precision M4E1-T Complete Upper Receiver Threaded 5.56x45mm Mid Pencil 16in Barrel ATLAS S-ONE 15in Handguard M-LOK Anodized Black

AERO PRECISION AR15 Complete Lower Receiver w/ MOE SL Grip & SL-S

Faxon Magazine Marker Bands 5.56, 223 Rubber Blue 10PK

M4e1 Assembled Upper Receiver 18'''' 5.56 Rifle Length - M4e1 5.56mm Assem Uppr Rcvr Govt 18'''' Bbl Rifle-Length Blk

Aero Precision M4E1 5.56mm M4 Carbine 16 Barrel Complete Upper Receiver

AR-STONER AR-15 Unassembled Rifle Kit 16" Barrel 5.56x45mm NATO

Faxon AR-15 Duty Series SOCOM Complete Upper Receiver Assembly 5.56x45mm NATO 16" Barrel Suppressor Ready

Faxon AR-15 Duty Series Gunner Complete Upper Receiver Assembly 5.56x45mm NATO 16" Barrel Suppressor Ready

Q LLC Sugar Weasel Upper 5.56 16" BCG Included

LaRue Tactical Match Grade AR-15 Complete Upper Receiver 5.56x45 NATO 16.1" Barrel

Shaw Barrels AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel 12" Handguard

American Tactical Omni Hybrid Battle Field Green 5.56 7.5 Barrel 30-Rounds w/ Duo Sight

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 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

Armaspec Superlight Gun Builders Kit Purple

FAB Defense MOJO Improved Magwell with Replaceable Grips Black

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