The Double Dog is equipped with a ported barrel with stylish diamond cuts. Its ergonomic, walnut grip helps minimize recoil and muzzle rise for maximum control; While the ported .357 Magnum chambering delivers "magnum force" on target; with just one crane screw washer you can switch to our 9mm Luger Pit Bull cylinder that comes with the firearm. The 9mm cylinder is designed to eliminate the need for moon clips. Both cylinders have the calibers laser engraved on them, so you can tell them apart. Includes two cylinders and extra crane screw washers.