I'm shooting a 20" 1/7 twist Bushmaster barreled upper built by PK Firearms. It has your standard A2 flash suppressor and front sight.
When I first started shooting it I was using a Rock River Arms NM carry handle as my rear sight and 62gr prvi partizan as my ammo. At 50yrds I was getting about 2-4" groups. I then added a Daniel Defense Omega free float hand guard and a Geissele SSA trigger and shrunk my goods to about 1" at 50yrds.
Regardless of the type of ammo I've used I can never hit paper at 100yrds. I'll check my sights at 50yrds and hit center of target but when I move my target out to 100yrds I don't hit anything.
I've also tried changing my sights to Troy folding BUIS as well as a Matech 600m BUIS.
The ammo I've used has been a mix of Lake City 55gr and 62gr, Brown Bear 55gr and 62gr, Prvi Partizan 62gr , PMC 62gr and Silver Bear 62gr. Everything with about the same results nothing ever printing on paper at 100yrds.
Before I get rid of this upper for a BCM or LaRue in 20", is there anything else you would try that I haven't already?

