 The -inch barrel on the Alaskan ends at the end of the frame, and the scope bases are omitted.The interchangeable front sight is replaced with a pinned-in ramp sight, but the adjustable rear sight is retained.The Alaskan is available in .44 Magnum, .454 Casull/.45 Colt, and .480 Ruger, with the .480 model originally a six-shot, replaced in 2008 with a five-shot model to aid in spent cartridge extraction.