Mine is sub 12 so has given me a lot of problems, I tried two of the Skout barrels but gave up and bought a Lothar Walther blank and machined to fit and this sorted my accuracy problems, but I have since been pursuing single figure FPS with no success, I get close, and then it all goes pear shaped, and I have to start over again, I have done quite a few modifications and although some have helped in the long run it just doesn't seem to stick, I am now thinking of getting some new regs especially since they have been updated as I always get quite a lot of creep that last for 5-10 shot before settling down but leave it for five mins and its creeping again, I am getting near then end with this rifle and thinking of selling as it just doesn't perform as advertised.