"1000000000000000000000 FPS it is sweet"? Morons have to much free time From what I can tell it is about 290 FPS. It looks a decent gun for the price. If you like this gun check out the Smith & Wesson M3000 Airsoft Shotgun.
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.
26-30 inches
Recommend you ask a gunsmith for help.
No, it shoots 3 at once.
I can't really help much without knowing which company it is made by, but you can look for the owners manual here <http://www.airsplat.com/airsoft-manuals.htm>
it depends what kind?
Well, the legal FPS for an airsoft gun is 450, but you can get snipers, AEG's, etc. that run up to 600 FPS and beyond.
go for the m14, unless its cheap looking.
Tactical Force TF11 CO2 SMG 350 fps pyramydair.com $79.99
360 fps
It has 450 fps