Bushmaster 0040004BLK M4 Patrolmans Upper 5.56x45mm NATO 16" Black Nitride Barrel, 7075-T6 Aluminum Black Receiver, M4 Handguard for AR-Platform $591.20
Patriot Ordnance Factory 01309 P415 Complete Upper (Piston Driven) 5.56x45mm NATO 16.50" Black Nitride Barrel Aluminum Black Anodized Receiver 14.50" M-LOK Handguard $1,359.00