The M14 is not ruined or bubbafied when put in a SAGE stock, it is enhanced for battle.
The action is tension bedded and the barrel is semi-floated, plus you get a solid optics platform.
IMHO, anything that keeps the old M14 in active service is a good thing.
I have to agree. You are going to ruin the resale value at the very least. If you feel the need to screw up a perfectly good weapon then buy a new model M1A from Springfield and screw that up.
If no one can talk you out of this desecration then at least keep all the original hardware and equipment and don't make any permenant mods to the basic rifle components so you can put it back together right when you grow up.
my M-14 is not exactly a "perfectly good weapon". i dont know how old it is, but its from springfield armory and it has seen better days (ill try to get a pic). the wood is dinged up and scratched and there is wear and scratches all over the metal. i think my uncle used to hunt with it (and maybe pound rocks with it from the looks of the wood) im going to reblue it and throw the wood away. i dont consider it "desecrating" it, more like resto-mod. its like taking a beat up old car and turning it into a hotrod rather than restoring it to original stock.