Paintball Gun Shell

Through my scouring of the internet, i remember coming across a strange vein of airsoft guns once that used actual brass shells with just a primer cap, to fire out the airsoft pellets (or some were small caliber paintball) but have since completely forgot what site had those. I remember in one of the Chuckie movies they were at a military school playing war games with something like this, ammo for conventional rifles that had paintballs instead of bullets, which then of course Chuckie swapped for the real thing. Now i've got plenty of good paintball guns and whatnot, i'm just looking for something eccentric, maybe to use as a sniper rifle (a small bore high velocity paintball, such as this would be) but mostly to waste money and show off. I mean if there was something that would give a loud report, fire blast, and actually fire a small paintball, that would be awesome.