Follow the instructions in the owner's manual. If you don't have one, go to the S&W web site and request one.
You will need to ask a gunsmith
4.5 or 6 inches
Uh with or without the bullets? uuh
The smith and wesson model 422 was introduced in 1987 and was discontinued in 1997.
100-225 USD
50-250 USD or so
22 LR
50- 250 usd
No way to really know.
You can get a manual for free from the S&W website.
150-300