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

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

ALEXANDER AR15 STANDARD UPPER - 300AAC 16" BLACK

LANTAC SF15 Recon Complete Upper Receiver 300 Blk 16"

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

AMERICAN TACTICAL IMPORTS AR15 Milsport RIA Alum Rec 300Blk 16" Rgr Stk 30rd

AERO PRECISION M5 308 Win Assembled Upper Receiver | OD Green

Steyr AUG A3 M2 300 Blackout 16" Barrel MUD Stock Steyr Mag Pattern AUGM2MUDEXT300