It's legal anywhere, so long as you possess a Type 07 or 10 Federal Firearms Licence with a Special Occupational Tax Class 2 tax stamp. If you possess these, then you can manufacture a silencer. If you don't, then it's illegal to do such, in any state or territory of the US.
It's illegal for a minor to buy a gun anywhere in the US.
No
yes it is illegal to own a sawed off shot gun in pennsylvania...as far as i know its illegal in every state of the US
Not unless there is a local law that says you must.
Depends on the law where YOU are. In MOST of the US, there is no requirement or procedure to register a gun- popular belief notwithstanding.
No. The US is very liberal about freedom of speech.
Some SWAT units do issued suppressed weapons.
In the US, it is illegal for some people to own a gun- convicted felons, persons that are mentally incompetent, etc. The background check is to insure that you are not a prohibited person.
false
In most of the US, they are legal. However, it will depend on the type of gun, and exactly where you are located. We get questions from several countries, and the list is far too broad to post here.
in the US, yes. You may make a gun for your own use. You must be old enough to possess a gun, and it must meet legal characteristics of a legal firearm.
Depending on where you live, it may or may not be illegal to make anti-police and anti-government music. In the US, it is not illegal as long as there are no threats.