5.56x45mm NATO Receivers

AERO PRECISION M4E1 Stripped Lower Receiver | OD Green Anodized

AERO PRECISION Gen II Carbine Complete AR15 Lower Receiver w/ A2 Grip - Black

M4e1 Upper Receivers Complete Threaded 5.56mm - M4e1 5.56 Assembled Upper Govt 18'''' Bbl Rifle Threaded Black

Mk16 Super Duty Complete Upper Receivers 5.56mm - Mk16 16'''' Super Duty Upper Chf Bbl, Ach, Nano Fh/Bcg Odg

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

Battle Arms AR-15 Ambidextrous Receiver Set Anodized Black

Ar-15 Stripped Lower Recievers - M4 Rebellious Stripes Stripped Lower Receiver Black

Sons Of Liberty Gun Works LOYAL9 Stripped Lower Receiver Multi-Cal

JL Billet Skeletor AR-15 5.56 Receiver Set

Ar-15 Tacoma Heritage Stripper Lower Receiver - Tacoma Heritage Stripped Lower For Ar-15 Black

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

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

AERO PRECISION M4E1 Complete Upper 16" 5.56 Mid-Length - Black

Aero Precision M4E1 Enhanced 10.5 5.56 Barrel Complete Upper Receiver

RUGER AR556 5.56 NATO AR15 Stripped Lower Receiver - Black

Sons Of Liberty Gun Works Scalper Stripped Lower Receiver Complete Lower Multi-Cal

M4-L89 5.56x45 Nato Assembled Upper Receiver - M4-L89 5.56x45 Nato 13.7''''bbl 13.75'''' L89 Rail W/Huxwrx Xl

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

PRI Mark 12 Mod 0 Gen II AR-15 Complete Upper Receiver 5.56x45mm NATO 18" Barrel 1:8" Twist Black

ODIN WORKS OTR-15 Lower/Upper Set 223 Rem/ 5.56 NATO Tan

Complete Ar-15 M4a1 Clone Lower Reciever - M4a1 Clone Complete Lower Receiver For Ar-15 Black

M4a1 Clone Lower Receiver - M4a1 Clone Stripped Lower Receiver For Ar-15 Black

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

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