Did a 9twist Lilja 22inch barrels for CZ457/455 on two different guns. The shim system is interesting, I've only set up one gun so far, hoping to get the second one out today. Initially I wasn't getting good groups and had extraction issues. I contacted Lilja and he gave some advice on the shim/head-space. Getting good groups out of that gun with the adjusted headspace and a tuner that I haven't even optimized yet...
My son's 455 VPT with OEM barrel shoots great. I went with the 1x9-22inch Lilja was to tweak out a gun for long range 22 matches.
