Hi guys, my friend brought one of these a while ago and hasnt used it for ages because of this issue, ive done loads of research and found a few great sites about theses markers but not the answer to this issue, if he walks the trigger for any amount of time and then stops, the marker cycles once more but without actually shooting the paintball, so that when he tries to fire again the next ball hits this stray ball thats now rolling around in the barrel? is this likely to be a timing issue or something else, any help would be great as he paid top dollar for it, if i seem to have missed any info please let me know, thanks a lot, daz