I would gather that the PGP (Paint-Gun-Pump) is about the most recognizable of Sheridan's brass markers, combined with its distinctive 'click-clack-bloop' operating sound. The integrated 10 round magazine, 12 gram power source, and pump action resulted in a reliable and (relatively) fast and reliable marker. This particular one has been outfitted with rubber grips in place of the original plastic, and an extended 12-gram knob that makes swapping out 12 gram cylinders slightly less of a chore.
