CZ USA 457 At-One Varmint uses the popular Boyds AT-ONE stock as its basis, this makes an ideal trainer. With the push of a button, length of pull can be adjusted from 12.5" to 14.25". Comb height is adjustable, with 5/8" of rise available. The laminate stock provides a rigid platform to work and the threaded heavy barrel makes fitting a suppressor easy. In addition to the receiver-mounted, push-to-fire safety, we chopped almost an inch of length from the action and slab-sided it to reduce its footprint and weight. With the same swappable barrel system as the 455 and the same polymer magazine system as the 457.