I have had a rifle length PRI forearm for a few weeks and just received a PRI PEQ top rail. When I first built the upper, I noticed the PRI barrel nut left a couple of exposed threads where the forearm screws onto the collar, but didn't think too much about it. So, today I get the top rail and it will not align with the mounting holes due the the inability of the forearm to screw completely down on the collar. It looks like the barrel nut needs to be reduced by ~ 2mm to close the gap. Anyone ever run into this?
