Tried search , not finding the answer. Going to place a 12FV assembly in to an Accu-Fit Accu-Stock. Understand that the recoil lug will not fit the aluminum rail with-out modification or replacement. Would require the tools to remove and replace the barrel, replacement nut & proper lug and Go/NoGo gauges. Cheaper route would be to modify the existing lug while still installed. Is there a templete available to follow or just go slow and free-hand it? Have die grinders, carbide burrs, grinding and cut-off wheels and files as needed. Would a lug alignmemt tool work as a gauge or are they just for general alignment.