No issues installing the barrel on my CZ457. After shooting 20 rounds I ran a bore snake through it and shot two 5 shot groups at 50 yards, All 5 shots in each group were in the same hole. I have never done that with any of my rifles.
Then I shot it at 100 yards and shot a 1/2 inch 5 shot group. The Lothar-Walther barrel is a keeper.
I wish I could attach pictures of the target with this review.