Some quick details about the Adapter;

It is designed to use milspec AR15 buffer tubes and adapt them to a standard 1mm thick stamped AKM pattern rifle. 
You can use an AR15 castle nut or a set screw inserted through the underside of the adapter to hold the tube in place.

Included are the STEP and STL, feel free to remix if you'd like but please credit :)

Some fitting may be required depending on the AK, if the holes are too tight for your screws use a drill and slowly open them up to fit. 
Do not do this with the adapter in the rifle, dont be that guy who drills through his reciever like a dingus >:( 

Recommend printing with 100% infill in PLA+ or stronger, the logo should be facing up for best print strength.

Questions, comments, concerns? DM me on twitter @ProSpaceDog