Yes. See related links for an example.
No
Depends entirely on the magazine. Some are not meant to be taken apart.
Yes
Drop the magazine and clear the chamber.
Lever Action Magazine Pistol
No
Try egunparts
You will have to find someone who specializes in air gun repair.
No such thing ans a "magazine clip". If you want a magazine for it, contact S&W or your nearest gun shop.
If someone has made one.
The Smith & Wesson 5906 typically holds 15 rounds in its standard magazine. However, with an extended magazine, it can accommodate up to 18 rounds. This double-action/single-action pistol is chambered for the 9mm cartridge.
50-325 usd