I am not sure the heating up theory pans out though. The first time the malfunction occurred, it was on the 3rd or 4th round fired out of the gun, I don't imagine that it could have gotten hot enough to expand so much so quickly after so few rounds. What's more, the gun functioned thereafter, with dozens of rounds between failures. Shouldn't it have expanded more as it got hotter and hotter, causing more frequent malfunction, rather than having the malfunctions scattered throughout?