they work great, tested and cycled, must use a good 3D printer, I printed these on my Ender 3 pro, use a 7/32" drill bit to clean up the hole on the .20 cal and a 15/64" for .22
also use 100% fill, speed 30, support all, no base.
View attachment Copy of HW100 Magazine .20 ver. 1.0.1633569188.stl
View attachment HW100_22_Magazine.1633569213.stl
also use 100% fill, speed 30, support all, no base.

