Thompson Center Encore Pro Hunter45/410 Vent Rib, 15" Smooth Blue Pistol Barrel- A LEGAL shotgun barrel for pistols because it has a RIFLED BORE. Shoots 3" 410 shells, includes a screw-in choke, vent rib and bead front sight. TC Encore Pistol Barrels fit Thompson Center Arms Encore and Pro Hunter Frames. This one is a 15" long, smooth, blue pistol barrel. Uses any TC Encore or Pro Hunter PISTOL forend.