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USGI Contract Overrun of the spring-loaded aperture assembly which normally sustains damage over time on the U.S. Army M4 series of rifles. This is the cost-effective solution to the longevity of your MaTech manufactured rear backup iron sight. These are original contract apertures that are spring-loaded and rest in a steel base which can be inserted where the damaged sight aperture is removed. This is the fix that U.S. Army ‘Armorers’ apply. The base is shown in photo for reference only and is not included with aperture.