This is an HK drum rear sight that is a drop in replacement for your GSG rear sight. Includes ball & spring. A dramatic improvement over the cheesy factory sight. Constructed of steel. This sight is suitable for duty or combat use in virtually any environment. It is intended as a fail safe device.

 I offer a 100% money back guarantee if you are not satisfied with this sight.

 Buyer pays fixed amount of $29 each anywhere in the U.S. 

If you wish to mail payment contact me via the email link for a mailing address.