No it won't hurt anything to put some epoxy under it or some Miceobed under it & lots of builders do it. If you have to replace it later (and you most likely never will) all you have to do is heat an iron & touch it for a minute & the epoxy will let go.
First, put it all in place, have the Entrypipe pinned in with the retainer pins & Make Sure the RR will slide into the RR hole thru the entrypipe easily. If it will not, you need to aquire this first......... Make sure your tail will not bend in too deep if you overinlet...... If it does, you will need a lil tiny sliver of wood to hold it up so it will not go to deep.
Then you are ready to clean the inside of the tail with some 150 grip sandpaper & make X hashes in it (the part being glued) put the epoxy on both surfaces (not too much, just a thumbnails diameter worth) put the entrypipe in & pin it with the retainer pins, make sure the tail went down into the epoxy (again, not too deep) & into the wood where ya want it. Put a piece of waxed paper over it & now a small piece of wood and then slide a rubber band over the stock & small wood block to hold the tail down into place. Now turn the rifle back over so it is horizontal with the barrel channel up, so the epoxy levels out & it doesn't drip into the barrel channel & block it.
Now keep in mind, just enough glue or Microbed to glue it down & a piece about the size of the thumbnail is adequate, don't go crazy with it or you will have to drill out the glue with a RR drill & that gets touchy with the brass piece on there.
:m2c: