Depends on who is using them and for what.
yes silencers are illegal in montana
Depending on who you are, no.
check with the prosecutor's office
Silencers are illegal in SOME states for the general public, but only a few. See link below
The answer can by yes or no depending on specifics which you don't go into.
Unfortunately yes. But there are ways around it.
if a gun has a threaded barrel, (required for a silencer) it is classified as an "assault weapon" and is illegal in California.
Silencers are regulated by the Federal Government and require BATF approval. Oregon does not ban the possession of silencers, IF, the person in possession has the required federal approval.Keep in mind, that in order to own one of these devices, you need permission from you local chief law enforcement agent.
yes but you have to jump through several hoops with the ATF to get one...better to just not get a silencer
No, you do not need a licence in Florida in order to buy a rifle.
It is illegal.
possesion of illegal firearms and silencers, i think there might be other stuff too