No, not advisable.
You cannot buy different sized shotgun magazines. However, I suggest getting a shotgun that takes airsoft shotgun shells. It will expand your options of bullet capacity.
It depends, if it is a real shotgun, you will probably die soon if you don't get help but if it is just an airsoft gun, definetly not.
A pump airsoft gun is a gun that has to be pumped every time before shooting. Ex. Airsoft shotgun
280 fps
$25-50
Yes.
Anything is possible.
FPS depends on the type of bb used, quality of the bb, weight of the bb, and the chronograph. On top of that, it depends what shotgun it is! There are many, many airsoft shotguns out there.
Pellets or slugs. shotguns usually shoot shot or pellets, but you can shoot slugs. in Indiana we use a shotgun to hunt deer and use shotgun slugs, better to use a barrel with no choke in it. cylinder bore preferred.
Barrel
Lead
Barrel