5.56x45mm NATO Receivers

AERO PRECISION M4E1 Complete Lower Receiver w/ MOE SL Grip & SL-S

Sr-15 Ks-3 5.56 Nato Assembled Upper Receiver - Sr-15 Ks-3 5.56 Nato 11.5'''' Bbl Assembled Upper Rcvr Black

Knights Armament Upper Receiver Kit 5.56 NATO 14.5 Barrel M-LOK

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 Stripped Lower Receivers - Ar-15 Super Duty Stripped Lower Receiver Black

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

M4e1 5.56 Assembled Upper Receiver W/M-Lok Atlas S-One Handguard - M4e1 5.56 Assm Uppr 11.5'''' Carbine 9'''' Atlas S-One Hg Blk

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-15 Blem Super Duty Stripped Lowers - Ar-15 Blemished Super Duty Lower 5.56mm Od Green

Forward Controls Design Billet Lower Receiver - Fcd Ambi Billet Stripped Lower Receiver For Ar-15 Blk

Ar-15 Stripped Lower Recievers - Lone Star Stripped Lower Receiver Black

Broadsword Billet Lower Receiver - Broadsword Billet Stripped Ambi Lower Receiver For Ar-15 Blk

Ar-15 Stripped Lower Recievers - M4 Angry Patriot Stripped Lower Receiver Black

Broadsword Billet Receiver Set - Broadsword Billet Stripped Ambi Receiver Set For Ar-15 Black

PRI Mark 12 Mod 0 AR-15 Complete Upper Receiver 5.56x45mm NATO 18" Barrel 1:7" Twist Flat Dark Earth

Ar-15 Billet Lower Receiver - Ar-15 Lower Receiver, Billett, Multi-Cal

AERO PRECISION M4E1 Stripped Lower Receiver ODG

Ar-15 Pistol Lowers Complete W/ Brace - Ar-15 Pistol Complete Lower W/ A2 Grip & Sba3 Brace Blk

Aero Precision M4E1 Enhanced Assembled AR-15 Upper Receiver No Forward Assist Aluminum Black

Ar-15 M16a4 Complete Lower Clone - M16a4 Clone Complete Lower Receiver For Ar-15 Black

Ar-15 Super Duty Stripped Upper Receivers 5.56mm - Ar-15 10.3'''' Top Tier Stripped Super Duty Upper Od Green

Ar-15 Super Duty Stripped Lower Receivers - Ar-15 Stripped Super Duty Lower Receiver Ddc