As usual, I agree with my friend 18DAI.
I am a mechanical engineer who does forensic engineering for a living. There are also several attorneys on the Forum.
If the OP would modify the gun, have an ND, and hurt or kill someone, the local prosecutor would eat him alive.
Currently there is a non TSW 4586 at Cherry's fine guns. Tag number is 34050SAL. They say it is NIB and it still has the round white inspection sticker on it.
http://cherrys.com/stokpics/34050sal.jpg
Why not become like the rest of us addicts and just buy more S&W's. Liability problem goes away, and you have another gun to appreciate in both the aesthetic and financial sense of the word.
Just my $0.02
S/F,
RAS (aka Walter)