Steel RMR footprint rear sight base for Glock

For sale is a steel RMR footprint rear sight base for the Glock series of pistols. This mounting plate came off a Glock 20. It fits into the rear sight channel of the Glock slide to allow the user to mount micro red dot sights that have the Trijicon RMR footprint, such as the Holosun 407/507 series.

Asking $50. 

Willing to ship at the Buyer's expense.