MP5K to G36 stock adapter

[UPDATE 28.4.2020] V2 release, changed hinge geometry, now stock should fold all the way.

[UPDATE 22.4.2020] Added new version, deleted old ones. New version is made to accommodate asymmetry of upper part of upper body in designs of most manufacturers(see upper pinhole protrusion).

TL;DR if old one fitted, this will too, but now it will fit other designs too. So far I only tested on JG mp5k.