if you're talking about the little adaptor that allows you to put an m4 type stock on your AK then as far as I know it fits on G&P metal receivers( not 100% sure. I have it but wouldn't bet my life it's a G&P).
Regardless this receiver does not have the tangs but just the little slotted knob at the back and I'm pretty sure this do-hickey is proprietary for this receiver type.
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