The reason why your question has not gotten the response you need is maybe because this topic has been covered and discussed so many times already. If you will do a search on this topic you may get the answer you seek.
Okay for your benefit, I have read the discussions about this and in my humble opinion, yes and no.
Yes, but you have to make sure that the stock would never be telescopic again. This means that should someone want to make it "telescope" he will destroy and render the stock totally useless in the process of doing so.
No, because if the BATF should get the itch to pick on you, they can always find a way to reverse the procedure that you did given enough time, tools and materials.
YMMV! Your call and please turn the caps lock toggle off!
Hope this helps