I am considering buying a rifle in McMillan htg type stock-has no studs-I want to add. I have installed them in wood & lam myself with good results. Any suggestions on how to best install in fiberglass? I assume the front is installed thru hole drilled through to bbl channel & attach nut in recess below bbl...how about the rear... Did a search here on SH & could not find anything. info appreciated.