You need a gunsmith
25-75 USD
10-80 USD or so
5-50 usd
Follow the instructions in the owner's manual. If you don't have one, take it to a gunsmith and ask to be shown,
Impossible to answer without the maker's name. Even then....
I have seen them recently at auction in the $175 dollar range.
No published data
The Butler 22 caliber single shot pistol was made by Derringer. The Derringer company was founded by Henry Derringer. Derringer pistols are the smallest handguns available and were most commonly used by women.
No published sn data.
NO. Do not attempt this.
22 caliber is the diameter of the bullet. 22 cal. comes in BBcap, short, long and long rifle
You should take a firearms class