TriStar 20120: The Raptor Series is TriStar's most affordable line of semi-automatic shotguns. The Raptor is a 3" gas-operated shotgun offered in 12 or 20 gauge. It features a highly durable molded stock and forearm, with a zero-plane stock for better feel. The Raptor comes standard with a fiber optic front sight and a ventilated butt pad.