Serpico Performance 22 Magnum Barrel for Bond Arms Derringer 3.5″ Barrel Length This barrel fits the original "Hand Cannon" models from Bond Arms. This barrel can fire .22 Winchester Magnum Rimfire ammunition. Machined from solid stainless bar stock.. Changing barrels requires an 1/8 inch Allen wrench. (Not Included) DO NOT DRY FIRE THIS BARREL Made in USA