What FPS do you get? I have a UK version Komodo and as far as I am aware I do not have the double BB problem but I am also sure that my gun does not have the spring release function (or it has never needed it). If I fire a single shot the bolt returns as it should without fail, in semi the bolt window stays open very slightly about 10mm even if I switch to safe, it will only close fully if I fire a single semi shot.