Are you having trouble with them. They run 100% in my 7.62x39 AR15's. They even work 100% when I put a 7.62x39 upper on my M16.
To be fair, I only had time to shoot one round this afternoon to see if it locked back. I call them janky because of the sharp edges on the feed lips, the unwelded/open front seam, and the unfinished floorplates. I bought 4 because I couldn't find anything else.
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