There are many shooting ranges, both indoor and outdoor, that may allow you to use their facilties; you can also try joining a local pistol or shooting club that can give free or subsidised access to such facilities, or further advice on where to go to pursue your hobby.
In the US, hundreds of thousands.
No. He may not possess a firearm anywhere in the US. Federal law.
Because its fully automatic, and was not importable pre 1986 (when the assault weapons ban was introduced). Only fully automatic weapons produced pre 1986 and were already legally owned in the US are now legal in the US. Although it IS legal for Police Departments to own Glock 18's, if they have been trained by Glock. It is also legal to own (in certain states, with strict stipulations), a Glock 17 (or any other model besides the 18) with a fully automatic sear. Which is essentially a Glock 18. **I Am NOT A Lawyer***
NO. Nowhere in the US is a convicted felon able to legally possess a firearm.
Glock's are for the most part, NOT automatic. They are SEMI-Automatic which means that each time the trigger is pulled, the firearm discharges one round. There are a few (most aren't in the US) Glock Model 18's that are what is know as "select fire" models. These models allow the user to select between semi auto mode and full auto mode. Fully automatic fire is when the trigger is depressed, the firearm discharges ammunition at a certain rate until either the mag- azine is empty, or the trigger is released.
If you are referring to a non-US citizen visiting the US LEGALLY, they MAY purchase a firearm for a legitimate sporting purpose, such as hunting.
It's considerably easier to own a firearm in the US legally than in any other country.
FBI and US Marshals issue Glock 22.
Yes. Only if it was made in the US before 1986 and follows all firearm laws, so yes, you can
No
Probably never.
The companies, or the firearms? Glock USA is an importer. Since Glock pistols cannot be shipped as is due to the provisions of the Gun Control Act of 1968, they have to be shipped with adjustable sights in order to be importable. Glock USA receives the pistols, removes the adjustable sights, and replaces them with the standard fixed Glock sight, manufactured in the US. The firearms themselves are pretty much the same, except American Glocks are sold with American made sights. The only other difference is that the .380 ACP Glocks - the Glock 25 and Glock 28 - are not available in the US as they cannot be made to meet the criteria of the Gun Control Act of 1968.