Ghost Firearms Elite Barreled AR-15 Upper Receiver - 300 Blackout - 16" - OD Green

CMMG Banshee Mk4 Suppressed Upper .300 BLK 6.5"

LWRC IC DI 16" .300 Blackout AR Rifle, PATRIOT BROWN

Franklin Armory 00-30030-BLK XO-26 R4 .300 Blackout 11.5" 30+1 Black

AERO PRECISION M5 308 Win Assembled Upper Receiver | OD Green

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

ATI OMNI HYBRID MAXX AR15 | 300 BLK | 16" Barrel | 30rd

DPMS UPPER BA-16A3L 5.56/.223 A3 16" LIGHT CONTOUR BLACK 60572