I have owned a .25 cal fx impact for about a year now and its been a journey learning to tune it.It came tuned for the 25kings and shot them well but....on windy days they got pushed around so i wanted to shoot the heaver 34gr JSB's. The mk2's made a big noise for a while and i tried them and the original mk1 heavy's and found my gun liked the originals. A couple months ago i received a proto type reg from huma and am just starting to fine tune my gun.It cured the creeping i was experiencing with the original fx reg and im still working on tightening up the es (12fps) Although im using more air to shoot them i have the heavy's shooting at 900-920fps and hitting like a freight train with some serious accuracy. I get 64 shots per fill befor falling of the reg. Id like to thank all the people who post all the helpful info on Airgun Nation. The pics are 5 shot groups
58 yards bipod, rear bag, plastic table.