Battle Arms Development WH556-LR-ODG Workhorse Lower Receiver OD Green Anodized for AR15/M16/M4

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

AERO PRECISION M4E1 Stripped Lower Receiver ODG

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

FAXON AR-15 X-TRA LITE RECEIVER SET OD GREEN STRIPPED

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

White Label Armory WLA-LOW-1015-01 Lower Parts Kit For AR-15 Black

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