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The G3 rear sight housing can be found mounted to the rear of the G3 receiver and houses both the windage screw as well as the rear sight cylinder. It is an original factory part made in Germany by HK.
Spare parts are an important consideration when it comes to firearms. Like any machine, firearms rely on a series of parts to function properly, including sights. If a part breaks or fails, a repair or replacement is necessary.
It is also important to consider availability. At this time, Keepshooting.com has a wealth of authentic, original factory parts from HK for the G3/HK91/PTR91. Not only are they readily available, but also they are cheap. Now is the time to take advantage.
The G3 rotary rear sight is a diopter sight, a form of aperture sight known for its high precision and adjustability. Able to compensate for both elevation and windage, the diopter sight features a small circular viewing hole meant to allow the shooter to easily and consistently center the front sight, providing more precise aiming.