Well, recently bought a G3 L7 bolt engine from here. Put it in marker and everything was good to go. Shot it a few times in the backyard, play a game or two.
So today I decided to go play some games with my friends at the field. Checked chrono and it was shooting 275 fps +/- 5 fps. We played a few games. Wasn't really shooting much. Last game we played, the gun had an air leak thru the barrel. Thought it was just a blown oring. Since it was the last game, I wasn't going to take it apart at the field. Waited till I got home.
Well, got home and started taking to Bolt engine out. Looked at the bolt and this was what I found : see pics then let me know what would have cause this issue. Thanks.
Notice the cracks on the top 2 air passage
Notice the space on the back lip