http://www.airsoftretreat.com/forums...3540.msg656422
try shimming first.
closer to the bottom of the thread.
if that doesnt work, you could take this into an an airgun smith. this particular TM model and all clones are similar in mechanics to pellet
airguns... and if they cant fix it, you'll need to do something drastic like rebuild your entire cylinder/bolt or get a new gun.
sorry buddy...sucks when a gun breaks.