this is a glock adapter for the magnetospeed. It's not my design, I just had the adapter separated from the rest of the STEP of the entire assembly from this file: https://grabcad.com/library/magnetospeed-rail-adapter-for-glock-1

full credit goes to the original designer.

To use you will need two screws and one bolt, 2 washers, 1 lock washer, and a wingnut, but i dont know the size (i just took it down to the hardware store and got what worked).