Go for it, brother!
The Saiga 12 is based on the all-that-and-a-bag-of-chips rugged AK-47 design, shoots just about any 12 gauge combat ammunition you can fit in the mags... and you can empty said 10-round mags as fast as you pull the trigger!
Educate yourself about the AA12 here:
http://world.guns.ru/shotgun/sh29-e.htm
Educate yourself about the Saiga 12 here:
http://world.guns.ru/shotgun/sh07-e.htm