My mak90 receiver was cut out for an underfolder. It has the factory holes in the receiver. Someone popped the plates off and put an underfold stock on it without a mechanism. It is bolted in place. It is a slant cut trunion without a tang (broke off?) and open on the lower part (I imagine for the dumbhole stock). I would guess for anything but a underfolder I would have to replace the trunion? By the way my uf has a pin in it on one of the arms at the front. Sorry I can't post pics. Any advice appreciated.
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