[Styrak]

So I got a King Arms Thompson M1A1 and mags for extremely cheap, with the knowledge that "something" was wrong with the gearbox, and that it was locked up. OK, will have to open it up and fix whatever is wrong, possibly replace parts.

The piston head was not attached to the piston, but the peculiar part was that it was BACKWARDS inside the cylinder. So it somehow got flipped around, and also I think the piston head screw had jammed up the gears which is why it wouldn't cycle at all.

But in the end nothing else was damaged, just had to clean it out from all the plastic bits from the destroyed piston head, put in a new piston head, shimmed it, and put it back together. Not too bad for a dirt cheap gun.