Ok, to throw this out first, I am in no way interested in the $200 BATF stamp for this. That said, I was thinking of getting my barrel shortened, having a flash hider pinned and welded for the 16" overall length and running something like a 15" troy rail (If I can find something that costs less than I paid for the rifle).. This is purely for looks, no real practical advantage I can see. Has anybody done this and how much of a PITA am I looking at? If you have, pics would also be nice.