Originally Posted by ThunderCactus (Post 730937)

I just fixed this problem a few weeks ago, I'm not sure if you did the same thing but if you put too big of a spring in a TM (or TM clone) gun, the mechbox WILL break. Now the mechbox is obviously mounted right behind the hopup chamber, so when the front of the mechbox shell breaks, the broken part of the shell is now pushing directly on the main gear of the hopup chamber.
So did your old mechbox break? Because that would definitely explain the broken chamber :)