Silencers are illegal in SOME states for the general public, but only a few. See link below
Silencers are not legal in the state of Iowa. Currently there are 39 out of 50 states that individuals, trusts and corporations can legally own silencers.
No. They trap and slow the release of gasses after the gun fires.
No
Typically steel or aluminum
According to what I found (a cursory search on the internet) silencers are legal in Kansas as of sometime in 2007 or 2008. Silencers are still regulated by federal law. To purchase one legally, you must go through a class 3 dealer.
Suppressors are legal, yes.
Yes. Must be registered with the Federal BATF, but state legal.
Basically any gun can have a silencer. Silencers don't work as well on revolvers, but any gun can be threaded for one.
No. California does not honor any "gun permits" from Nevada. I assume you are referring to the Nevada CCW (Concealed Carry of a Weapon) permit as Nevada does not have any actual "gun permits".
there was yo-yos dolls jumpropes gun silencers and the vaccum cleaner
if a gun has a threaded barrel, (required for a silencer) it is classified as an "assault weapon" and is illegal in California.