Korth in the "production" category. Get into the "custom" side and you can spend money in amounts that would buy houses.
The most accurate handgun is the CZ 75 SP-01 and it retails at around $600 - $700.
A water pistol.
No
Handgun
In most circumstances, no. The bullet is too large to chamber in the handgun.
handgun
Unknown
Rifle or handgun?
22LR
A VERY good handgun- for most puposes. Durable, reliable, accurate, and powerful.
It depends on the state, and on what you mean. If you mean a license to carry a handgun, most, but not all states require you to be at least 21.
Probably, almost certainly, the .600 Nitro Express is the overall most power handgun bullet. Let me alter this answer by saying the .600 Nitro Express is a rifle round that one company made a pistol for. The most powerful handgun cartridge is the 500 S&W Magnum.