Hi I have a as new CMMG 16in .300 blackout custom upper for sale. This is there 16in nitrocarinzed 1/7 twist. M/P tested. Carbine gas system. With Flat top M4 upper, Comes with MI Gen II FF rail, Pannel kit and extra rails. Spikes tactical bolt group and BCM Med tactical chargeing handle. $525 Face to face in the salem-woodburn-portland areas. Sorry no trades.