Bond Arms BABL42545410: A longer barrel currently offered for the Bond Arms Derringer, this 4.25\" barrel also known as the Snake Slayer IV, barrel comes our most popular calibers. Like all Bond Arms Derringer barrels, this 4.25\" barrel will fit any of our original hand cannon frames. So whether you are looking to give your derringer a different look or expand the caliber capability of you favorite conceal and carry firearm, you can be sure this Bond Arms replacement barrel will perform with the style and reliability you expect from Bond Arms.