Just got my ACR, a basic folder. Went to the range and planned on shooting 200 rounds. Didn't get out there until after noon and it was miserable hot! Central Florida hot and muggy, so I only shot 100. Zero'd the MPBUS sights at 25m. I was impressed at the accurancy! Even with my old eyes I was consistently shooting 1 1/2 inch groups with the MPBUS. Played a little then, ringing the gong at 200m and some rapid fire for fun. Never a hiccup! Too hot by then. Went home and clean up was a breeze. Going back soon (earlier and cooler I hope) and zero the aimpoint, try removing the barrel to check for shift and just fun. I Love this weapon!