Great uppper - Bushmaster XM-15 Complete Upper w/Bolt 5.56/223 Varminter ORC 24 in. Fluted Barrel 1x9 Twist Post-Ban

Phenomenally accurate. May fit tight on your lower. It needs to fit tight for accuracy. This is not the problem with the upper, but you need a good trigger to do this upper justice. I honed my trigger, but I can't make it match grade. A stock standard AR trigger won't allow you to get the best accuracy. Eventually I am going to go to a Wilson trigger.