Hey airgun nation fans, there is my question hope some one can help me, i got my fx wildcat mk3 bt sniper .22 from a Portuguese deller and here we have restictions to max 12ft energi, im byuing parts to unrestrict my gun, allready change the transfere port and i got a 4 mm (11gr) hummer my question is, my gun (restricted) came with 1mm (6 gr) hammer and 60mm spring now im changing to 4mm hammer to get more power can i use the 60mm spring or need to change to the 56mm spring? will that damage my valve by hitting to hard? or if i lower the ajust screw to minimal can i get 900 fps on my jsb 18 gr pellets thats my question befoure i brake my gun or something.