Aero/cross machine and tool 13.7 upper

Brand new upper built by ray gunworks
Aero precision stripped upper
Ballistic advantage 13.7 modern series 5.56 barrel
Mid length gas system
1/2x28 threads 
1/7 twist
Cross machine and tool HDM 13” rail
No muzzle device, bcg or charging handle included! 
Muzzle device can be installed for no extra charge, just purchase at the same time and leave us a note to install