5.56x45mm NATO Upper Receivers

Knights Armament Company AR-15 Upper 5.56 NATO

Knights Armament Upper Receiver Kit 5.56 NATO 11.5 Barrel M-LOK

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

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

SPIKES TACTICAL Complete Upper 5.56x45 16" Black Mid-length AR15

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

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

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

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

American Tactical AR15 Upper Receiver Stripped Multiple Caliber

TROY A3 COMPLETE UPPR 556 16"

Luth-AR-15 Complete Upper 5.56mm 16 Barrel M-LOK Handguard

Luth-ar Lo-Drag Classic Bull Complete Upper 5.56 / .223 Rem 16 Threaded Barrel

Wilson Combat Upper Receiver 5.56x45mm NATO AR-15 Billet Anodized Black

JE Machine Tech Dust Cover for AR-15

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

TACFIRE AR-15 5.56/.233/.300AAC Stripped Upper Receiver

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

CMC Triggers AR-15 Stripped Upper Receiver 5.56

VKTR Industries 13.7in VK-1 Complete AR-15 Upper w/ HUX WRX Flash Hider XL QD Cerakote Magpul FDE

Q LLC Sugar Weasel Upper 5.56 16" BCG Included

LaRue Tactical Stealth 2.0 AR-15 Upper Receiver Handguard Combo 13"