I'm curious about noise suppressors (silencers). Mostly, I think it would be cool to have one. I have a lot of questions about them though. 1) Is a suppressor gun-specific? Or caliber specific? Rifle vs. pistol specific? You get my drift. 2) Is the tax stamp per suppressor? 3) Is the tax stamp person-specific? If my wife got one, would I be able to shoot it and if so under what conditions? Could we let someone else shoot it? 4) Does a gun need to be modified to use the suppressor? 5) How heavy are they? 6) How hard are they to remove? Do they really just screw on like in the movies? 7) How much do they affect the trajectory or velocity of a bullet? OK, that's it for now. Thanks!