5.56x45mm NATO Receivers

Sharps Bros Assembled AR-15 Billet Upper Receiver Aluminum Black

Radian Weapons Model 1 Upper Flat Dark Earth 5.56 14 Handguard

Spikes Tactical 5.56 NATO M4 LE Upper 16-inch Black LE

Strike Industries Enhanced Ultimate Dust Cover AR-15 Ejection Port Cover Polymer Flat Dark Earth

Gemtech GVAC Complete Upper 5.56 16 Barrel

FightLite Industries MCR Dual Feed Upper 5.56 12.5 Barrel

Radian Weapons Upper/Handguard Set Flat Dark Earth 5.56

Luth-AR A1 Stripped Upper Receiver With M4 Feed Ramp

Battle Arms Development Billet Upper Receiver Fits FORTIS REV II Rail

Colt AR-15 Pistol Complete Upper Receiver 5.56x45mm NATO 11.5" Barrel

One Horse OH-15 Complete Pistol Upper 5.56 10.5 Barrel CH/BCG

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

Aero Precision M4E1 Enhanced Assembled AR-15 Upper Receiver Aluminum Black

Luth-Ar Slick Side A1 5.56 NATO Ar-15 Upper Assembled Receiver Anodized

Colt Monolithic AR-15 Pistol Complete Upper Receiver 5.56x45mm NATO 11.5" Barrel

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

One Horse OH-15 Complete Pistol Upper 5.56 7.5 Barrel CH BCG

SilencerCo SCO15 Stripped Upper Receiver for AR-15

Faxon AR-15 ARAK-21 Upper Receiver Assembly 5.56x45mm NATO 12.5" Barrel

Aero Precision M4E1 Standard Stripped AR-15 Upper Receiver Aluminum Black

Aero Precision Standard Assembled AR-15 Upper Receiver Aluminum Black

Broadsword Billet Upper Receiver - Broadsword-89 Billet Stripped Upper Receiver Black

Colt Firearms LE6920 Complete Upper 5.56 NATO / .223 Rem 16 Barrel

Radian Weapons Model 1 10" Upper Receiver and Handguard Set, Flat Dark Earth