My AK does this. Havent tried to devise a solution yet. Thought about opening up the rear of the ejection port and making a buffer for it somehow.Getting tired of cut looking dents in my cases. I deburred the sharp, machined edge, rear of the ejection port on an AR. The sharp edge before transitioning into the receiver bump thingy.
The cases still dent but there's not a sharp edge gouge in the cases.
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