Well made upper assembly. - Bushmaster XM-15 Complete Upper w/Bolt 5.56/223 Predator ORC 20 in. Fluted Barrel 1x8 Twist Post-Ban

I have 4 different brands of uppers to compare the Bushmaster Predator 20 in. model with. Colt, DPMS, Rockriver Arms, and Windham Weaponry. Haven't taken it to the range yet, just received it the other day. After cleaning it I mated it up with a Spikes Tactical lower. The fit was nice and tight, no wobble at all. Function checked it with all 4 of my lowers. Will sight it in at 100yds and give update and what optics I used.