AERO PRECISION AR5 Multi-Caliber Complete Lower Receiver w/ MOE Grip & SL-K Stock - Black

AERO PRECISION M4E1 Multi Caliber Complete AR15 Lower Receiver w/ A2 Grip & M4 Stock - FDE

AERO PRECISION M4E1 Rifle Cmplt Lower Rcv A2 Grip No Stock Black

AERO PRECISION M4E1-T 5.56 NATO 11.5" Complete Upper Receiver | Black

GREAT LAKES FIREARMS Lower Group AR15 5.56mm w/Adjustable Stock Black

Wraithworks Billet Slick Side AR-15 Upper Receiver - Black | No Forward Assist or Brass Deflector

AERO PRECISION M5 Complete Upper 22" 6.5 CM SS Fluted SM15 Ano

AERO PRECISION M5 20" .308 CMV Complete Upper Receiver w/ ATLAS S-ONE M-Lok 15" Handguard