I have for sale an unfinished Galil Magazine adapter. I obtained it for a dimensional experiment, but did not use it or alter it in any way.
The adapter is in unfinished condition, and requires drilling of the mag catch hole, refinishing, and installation of the mag catch. They each come with a mag catch, roll pin, and spring (all parts you need to finish are included). It is in the white, but bead-blasted to take whatever finish you'd like. The one I'm selling has more surface rust than the one in the picture, however.