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The G3 rear sight cylinder can be found mounted to the rotating threaded disc on the G3 rear sight housing. It is a rotating diopter drum sight that is noted for its precision and adjustability. To use, begin by setting the cylinder to the desired aperture setting. Then, peer through the aperture hole and pick up the front sight. 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.