I was at the range yesterday and was shooting my M1icon at the 100yd target. I had an original M3 flash-hider installed on the barrel. The groupings (5 shot) formed about a 5" group around the bull......I then removed the M3 flashider and proceeded to shot another 5 shot group without adjusting the sights..... the group was lower by about 6". I was getting dark so I could not try to repeat the same test but I'm fairly confident the results would have been the same.
Any thoughts as to why the grouping changed dramatically??
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