what kinda pistols (semi -autos) could i use that takes silencers?
Depends really, you can buy one thats ready like the HK USP .45 but you're going to pay a solid premium on it and it doesnt include the silencer. You're talking $2K +
You can just buy a handgun, get a separate (aftermarket) barrel thats a little longer and have it threaded. Some can even be ordered threaded. I would honestly check up on a gun forum of your choosing. The search button will be your ticket, Ive ran across that topic on glocktalk.com, etc. Im sure Sig forums, and the like will have info.
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Dont worry, they ARE legal. Very much depends on the state you're in. So long as its not CA, NY, NJ, etc. type laws, you should be alright. Id check local laws though. A silencer in CA will get you some time. Here in AZ its legal, you have to jump through some hoops though. Same thing with fully automatic firearms, and even shortbarrel shotguns aka Sawedoffs. Gun laws are VERY precise so I wouldnt recommend trying a hand at luck.
The legal limit for most shotguns is an 18" barrel. If its measured 0.1" shorter, and you havnt jumped through those hoops, you'd better be calling your lawyer because you're in knee deep.
Just to clarify though, you're NOT supposed to use them for any type of defense situation. Thats a hole even the best lawyer will have a hard time digging you out of //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif They're fine for fun though.