The Airtech Studios Universal Mag Adapter - Odin Midcap adapter.  Made to work with both the Odin and Maxx midcap speedloaders.  Mounts in your M4 speedloader and can accommodate all midcap types.  Compatible with AEG midcaps:  AK, G36, MP5, MP7, M14, sniper rifle mags, GAT, scar-h, etc...

Includes a strap to mount for easy of loading.  Easy to click in and out of the adapter.  This is not a 3D printed adapter.  Made by Airtech Studios in HK.