I have a Troy Alpha that was driving me nuts. It wouldn't snug up properly on the barrel nut no matter how hard I tried.

Turns out the issue was not with the Troy rail, but the DPMS barrel nut. Turns out, DPMS barrel nuts have a history of being out of spec.

I switched to a cheap Delton barrel nut and the Alpha rail snugged right up the first time.

Just an FYI for all you builders.

You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.

You cannot over estimate the unimportance of nearly everything. John Maxwell