ALOT of police have gone from .38 revolvers to S&W 9mm to S&W 40cals. to now Sig 40cals.

And yeah that video shows what I was talking about with the 4-10 shells. That gun is kinda cool but I dont see myself using that gun "just for fun" its more of a specialty gun.

But now a days if you can dream it up its out there. They even have fully automatic 12g shotguns!