Made to work with Ludex m4 and m16 speed loader, also works with Oden M12. Should work with other sidewinder clones. 

 Ludex m4 mag speed loader

Oden Sidewinder m4 mag speed loader

I designed this to have an easier and faster way to load my mp5 mid caps. 

Remember that some bb's will stay stuck in the channel and will fall out when you tip it over without a mag. 

The hole in the side is for the spin handle to fit inside of. 

Directions: Insert adapter into Ludex speed loader. Only one orientation works. Hold it upside down and press your mp5 mag inside the 3 white walls in the orientation pictured. Spin your speed loader and watch as your mag magically fills!

Print instructions: honestly anything should work, I printed with 3 walls 20% cubic infill, would also recommend supports only on the upper bottom section as well as in the hole in the side.

No hardware needed.

(This is NOT an m4 to mp5 magazine adapter for game use and wont work as such, it doesn't hold the mp5 mags in place, that's your job.)