Using the popular Boyd’s AT-ONE stock as its basis, this 457 Varmint variant makes an ideal trainer for the whole family. With the push of a button, length of pull can be adjusted from 12.5 to 14.25. Comb height is similarly adjustable, with 5/8 of rise available. The stiff laminate stock provides a nice, rigid platform from which to work and the 16.5 threaded heavy barrel makes fitting a suppressor easy. The stamped bottom metal of the 455 is gone, swapped for a classy two-piece interlocking system. To make scope fitment easier, we ditched the 90 degree bolt rotation in favor of 60 degree, allowing for larger ocular bell diameters with lower ring heights. To top it all off, the 457 now features a trigger adjustable for weight, creep and over-travel. 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 ever fielded.