They both are for full stock variants; once is simply for a TM style stock trunnion like those seen on Tokyo Marui and cheap clone AKs. The other is for newer CA/VFC style AK receivers.
If you want a "tacti-cool" AK, you really need to start off with a full stock model and go from there. At the very least, you are looking at a new receiver + stock trunnion IOT fit either of those adapters on.
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