threads on a western arms pistol.

i have a western arms kimber 1911 lapd swat custom II pistol. i would like to add a silencer that shoots smoke out every time you pull the trigger(pfi smokecap)). do you know how to make this possible? there must be some sort of adapter or something. can anybody point me in the right direction of what(or who) i need to do to get this gun threaded. anybody happen to have a cnc machine that can do this just laying around your house?