It's a safety feature. This is the vent hole to release gas from ruptured case. It goes through the receiver right at the position of the extractor slot on the chamber end of the barrel. In older BRNO gun there were TWO holes, left and right. Those old ammo must have plenty of gas to vent... I guess.
Wow, thanks for the description!
It's interesting, because when I was cleaning/wiping the CZ, I noticed a thin ring of some type of debris around that hole, so I was wondering where that came from
Ok, thanks again,
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