With the exact same swappable barrel system as the 455 and the same reliable polymer magazine system the 457 At-One Varmint s 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 60 degree allowing for larger ocular bell diameters with lower ring heights. FEATURES: Adjustable trigger; 60 Degree bolt rotation; Two-Position Safety FINISH: BLACK