CZ USA 02312: On the CZ 457 Americans we have added American style push-to-fire safety. In addition, to the receiver mounted safety, we chopped almost an inch of length from the action and slab sided it to reduce its footprint and weight. The stamped bottom metal of the 455 is gone, swapped for a two piece setup. To make scope mount fit easier we went to a 60 degree rotation instead of 90 degrees, allowing bell diameters with lower ring heights. The 457 now features a trigger adjustable for weight, creep and overtravel. With the exact same swappable barrel and stock system as the 455 and the same polymer magazine system, the 457 is the best rimfire platform we\'ve ever fielded. Features a 11mm dovetail milled into the receiver.