5.56x45mm NATO Upper Receivers

Aero Precision AR15 Complete Upper 16in 5.56 Mid-Length Barrel w/ Pinned FSB M4 Handguard Includes BCG & CH Anodized Black

Aero Precision AR-15 Barreled Upper Receiver 5.56x45mm NATO 10.5" Barrel MOE Carbine Handguard Flat Dark Earth

Aero Precision AR-15 Complete Upper Receiver 5.56 Mid-Length 16 inch Barrel w/Pinned FSB Magpul MOE Handguard A2 Flash Hider FDE Cerakote

Aero Precision AR-15 Barreled Upper Receiver 5.56x45mm NATO 20" Barrel MOE Handguard Black

Aero Precision M4E1-E Complete Upper 14.5in 5.56 M4 Carbine Barrel EM-12 Handguard Gen 2 Anodized Black

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 16in Mid Length Pencil Barrel 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 16in M4 Barrel 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black Anodized

AERO PRECISION M4E1-T Complete Upper, 16" 5.56 Mid-Length BRL 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

Aero Precision AR-15 M4E1 Barreled Upper Receiver 5.56x45mm NATO 16" Barrel Atlas S-One M-LOK Handguard Flat Dark Earth

Aero Precision Complete Upper Receiver M4E1-T 5.56 16in M4 Barrel 15in M-LOK ATLAS S-ONE Handguard Anodized Black

Aero Precision Complete Upper Receiver M4E1-T 14.5in 5.56 Mid Barrel 12in M-LOK ATLAS S-ONE Handguard Anodized Black

Aero Precision Complete Upper Receiver M4E1-T 10.5in 5.56 Barrel 9in M-LOK ATLAS S-ONE Handguard Cerakote Flat Dark Earth

American Tactical AR-15 Complete Upper 5.56 / .223 Rem 16 Threaded Barrel 15 M-LOK Handguard

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

Daniel Defense AR-15 M4A1 Complete Upper Receiver 5.56x45mm 14.5" Pinned Extended Flash Hider

Ar-15 Super Duty Nano Complete Upper Receivers 5.56mm - Ar-15 10.3'''' Super Duty Nano Complete Upper Receiver Odg

Geissele Super Duty AR-15 Pistol Barreled Receiver 5.56x45mm NATO 14.5" Barrel Desert Dirt

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 17 in M-LOK FDE

Radian Weapons Model 1 Upper Receiver and Hand Guard Set 17 in M-LOK Radian Brown

Aim Sports Complete Upper AR-15 Kit 10.5 Barrel 5.56 NATO

Aim Sports Complete AR-15 Build Kit 5.56x45mm NATO 16 Barrel

Aero Precision AR-15 M4E1-E Barreled Upper Receiver 5.56x45mm NATO 14.5" Barrel 12.7" ATLAS R-ONE Handguard with Pinned Epsilon SL Muzzle Device Black

M4e1 5.56mm Assembled Upper Receiver W/Atlas R-One Handguard - M4e1 5.56 Assem Upper Govt 11.5'''' Bbl Carbine Threaded Fde