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I can find an underfolder stock for around 20, the problem will be installing it. Wire side folders seem to run around 70 or more, but they seem like a simple matter of unbolting the fixed stock and bolting the folder on in its place.
I also worry that an underfolder wouldn't clear the magazine to open or close...
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or course the problem will be installing an underfolder on a fixed stock receiver it wont be bolt on its not an ar
but if you can find a template to lay on the metal anything can be done with some drill bits and die grinder/dremmel tool if you got the skills
and im sure there are templates online
the trick will be printing them to exact scale
of if you can find a flat thats underfolder
maybe hold that right over yours and trace out the holes if you can figure that out as it has to be pretty precise
or use it as reference with a set of calipers
http://www.brownells.com/rifle-parts/receiver-parts/receivers/actions/ak-47-polish-underfolder-reciever-flat-prod42448.aspx
and it will fold and open with a standard 30rd mag
they have a slot cut out in the shoulder pad for that reason
they would have not made that design if it wouldnt work on the standard 30rd mags