PROOF Research CZ 455/457 Prefit Barrels

If you're a fan of the CZ 455 & 457 22 LR, you'll be an even bigger fan of PROOF Research's pre-fitted carbon barrels.
These are cut with a Bentz chamber and 0.044″ +/- 0001″ top space (depending on your action).
The 16.1″ barrel weighs 456g, the 18.5″ barrel weighs 708g and the 20″ barrel weighs 765g.