Spikes Tactical Punisher Lower/Upper Receiver Set, Semi-automatic, 223 Remington/556NATO, Cerakote Finish, Patriot Brown, Includes 9 in SAR3 Rail STS1615-PB9S

Spikes Tactical Complete Upper Receiver, 223 Rem/556NATO, 14.5 in Barrel (16 in OAL with Pinned Brake), Mid-length Gas System, Fits AR Rifles, Black, Flat Top Receiver, No Sights, 12 in CRR Quad Rail, Dynacomp Muzzle Brake, No Mags STU5050-CQ2D

Radian Weapons R0404 Multi Caliber N/A Gray Cerakote Billet Upper Lower Set

Aero Precision AR-15 Stripped Upper Receiver - Slick Side - Black

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

Aero Precision M5 AR-308 Stripped Upper Receiver - FDE Cerakote

Spike's Tactical Spider AR-15 Stripped Receiver Set Anodized Flat Dark Earth

SPIKE'S TACTICAL No Logo II Semi-Automatic 223 Rem/556 NATO Black Non-Color Stripped Lower Receiver (STLS045)