Modded cz 200. 177 jsb 10.3 @ 810 for 15 for. Ragged cloverleaf @ 45 yds. Extra tube with Pott removed. Tweaked valve. Jsb 13.4 @ 845 for 21 fpe or jsb 10.3 @ 935 for 20 fpe. 3mm x 8mm hex screw used for TP. Same cloverleaf groups @ 45 yds. Aeon 6-24 scope.