Sons of Liberty Gun Works / Forward Controls Design Billet Ambi AR-15 Lower Receiver - BLEM

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

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

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

GUNTEC AR15 SLABSIDE STRIPPED BILLET UPPER RECEIVER BLACK

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

TACFIRE AR-15 Billet Slick Upper Receiver Black

ONE HORSE AR15 A3 Stripped Upper Receiver Anodized