I have an M&A 16 inch flattop HBAR kit on a Bushmaster lower and a Rock River Arms tactical carry handle with A2 sights. When shooting at different distances, 50, 100, 200 and 300 meters my groups all look the same. centered on the target horizontally but scattered vertically across the target. At 50 meters the groups form a single vertical line about 4 inches long in the middle of the target, at 100 meters it looks about the same except about 6-8 inches long, 200 meters is the same but about a foot long vertical spread. At 300 meters I am lucky to hit the target, however the rounds that do hit are normally centered but scattered up and down the target. I am thinking it is either the hammer spring is way too strong and causing movement upon release or I am making some kind of mistake in my manipulation of the trigger. Any opinions would be appreciated.