This gun was built to cycle subsonic 300 blackout with a suppressor. I do not recommend shooting supersonics through this unless you change the buffer or gas adjustment. It will need to be tuned to your specific can.
Build specs: Spikes Lower Timney Trigger Magpul stock and grip Aero 16" .300 BLK with adjustable gas block threaded 5/8-24 upper Holosun dot/magnifier combo Nickle Boron BCG Ambi charging handle