Does anyone know where to get this Glock Auto Sear so you can convert a Glock 17 to fully automatic?

If you can order abroad, then no problem for small money, such a selector, will cost nix:

https://vitowhisper.com/product/full-auto-glock-selector-switch-vwgsfass4/

https://guntycoons.com/product/glock-switch/

Or the inconspicuous permanent reconstruction that you can also make yourself from the 3D printer…

https://pinshape.com/items/116115-3d-printed-25-on-telegram-gas-sell-invisible-switch

For the 3D printer, there is also a switchable version.

https://pinshape.com/items/116117-3d-printed-25-on-telegram-gas-sell-glock-full-auto-switch

In Germany you do not need permission for the parts, you can simply buy it, you can easily own it.

If you are grown with us in Germany, you are the poorest pig…