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My KWA M93r did the same thing a couple weeks ago (minus the shooting-of-parts excitement).
The gun started out fine, then was venting gas after about 5 shots from a full mag.
The problem, as you might have also determined, wasn't the mag, as I found no issue following its inspection.
Next thing was the cylinder splitting in half - exactly at the pin, like in your case.
Poor design.
I believe the issue stemmed from lack of lubrication in the cylinder's sliding path. It was pretty dry inside when it happened, and its obviously a high friction area with a lot of motion.
So far I've placed an order for 2 stock cylinder replacement from KWA, as there doesn't seem to be any upgrade for it at this time.
If anyone knows of a metal upgrade part, I'd love to get ahold of one.
Once the replacement arrives, will try again with plenty-o lube. (ordered 2 parts, incase that isn't the main problem)
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