Bear Creek Arsenal BC-15 AR-15 Upper Receiver 300 Blackout 10.5" Barrel

TacFire AR-15 .300 Blackout Unassembled Upper Receiver Kit - 5"

LANTAC SF15 Recon Complete Upper Receiver 300 Blk 16"

ALEXANDER AR15 STANDARD UPPER - 300AAC 16" BLACK

AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black

CMMG BANSHEE MK4 UPPER SUPP'D 300BLK 6.5 BLK

Patriot Ordnance Factory Wonder 13.75 300 Blue Titanium Mid Length Upper

CMMG 30BC40AMB Resolute MK4 300 Blackout 16.10", Midnight Bronze, M-LOK Free-Float Handguard for AR-Platform (No BCG or Charging Handle)