CZ 457 American, Bolt Action Rifle, 22 Long Rifle, 20 Barrel, Threaded 1/2X28, 11mm Dovetail, Stainless Steel Finish, Black Synthetic Stock, 5 Rounds 02395 With the exact same swappable barrel system as the 455 and the same reliable polymer magazine system, the 457 is without a doubt the best rimfire platform CZ has ever fielded. The 457 now features a trigger adjustable for weight, creep and over-travel. The stamped bottom metal of the 455 is gone, swapped for a classy two-piece interlocking system. To make scope fitment easier, CZ ditched the 90 degree bolt rotation in favor of a 60 degree, allowing for larger ocular bell diameters with lower ring heights.