M4 to AK stock adapter
thingiverse
I didn't want to spend $80 for a M4 to AK stock adapter so I figured I would see how strong a printed one would be, so far so good..... I printed it at 100% infill with hatchbox PLA and 100% infill in Carbon fiber PETG, both have handled lots of play time on my son's airsoft AK and even tested it on my lynx 12 shotgun. The single unthreaded screw hole on the top allows for you to screw in your factory stock screw and it will cut threads on first installation. The hole through the middle from back to front is if you want extra strength you can add an M6x40 machine screw and a nut, and tighten until snug to add some rigidity (think rebar in concrete) I have used it without the bolt and it worked well but added the bolt hole just in case.
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