Summary If you found this useful feel free to drop me a tip. I was getting tired of loading my many shells with a "speed loader" and I already had an Odin M4 loader that I really loved. I tried using a "universal" adapter I found online but I found it really cumbersome because I had to hold the shell, the loader and then turn the crank. So I set off and developed this simple adapter. You will need a screw to keep the sliding piece in the adapter, any m4 screw or something that size should fit. You can print it in the orientation that the STL file is in. you will only require supports for the base when it prints, should be fine without supports for the rest.