I've been having problems with my T68 pistol jack hammering (I think that's the right term...it continuously tries to fire, but doesn't recock). I've tried for almost a year now to fix it, and have contacted RAP4 tech support twice during that time, but I still haven't figured out the problem. I purchased a seal kit and replaced every part that was included in the kit, and changed the bolt o-ring with a polythene tank o-ring (techs said the bolt uses tank o-rings). I have tested the marker with both CO2 cartridges and nitrogen using a remote line, but both result in the same thing. I have even made sure the velocity bolt wasn't too far in or out, but the problem persists.
Does anyone have any suggestions on how I could try to fix this? Any input would be appreciated.