I just started a new build and came across an interesting problem. My new barrel nut wrench doesn't fit my barrel nut! I purchased the following 2 items in hopes that I could torque on a compatible nut to install a Troy MRF-308 on a new JD machine upper. Apparently I was incorrect. If the PRI wrench that's apparently designed for DPMS/KAC platforms doesn't fit, what does? Or is it my barrel nut that's the issue? Either way I'm stumped and I'm hoping there's a more clear answer out there! :) PRECISION REFLEX, INC. - DPMS/KAC 308 Barrel Nut Torque Wrench http://www.brownells.com/gunsmith-tools-supplies/rifle-tools/wrenches/dpms-kac-308-barrel-nut-torque-wrench-prod54765.aspx?psize=96 DPMS FIREARMS LLC - .308AR BARREL NUT http://www.brownells.com/rifle-parts/barrel-parts/rifle-barrel-hardware/barrel-nuts/308ar-barrel-nut-prod44324.aspx?psize=96 - Mr. M