The Trijicon RMR/SRO Full Co-Witness Quick Release mount features a Mil-Spec drop test rated 7075-T6 aluminum design, with an easy to use one handed tool less mounting system.This Return to Zero mount boasts a low weight and low profile design, compatible with any Picatinny rail. Designed specifically for the Trijicon RMR. This lightweight full co-Witness mount is perfect for mounting the RMR or SRO on any rifle platform with a Picatinny rail. The AC32074 provides a Full Co-Witness with backup iron sights. This means that the RMR/SRO is mounted at the same height as the iron sights. The optic's aiming dot will appear at the top of the iron sight post. This mount is typically used with flip up iron sights.Features:Distance from top of mounting rail to optical axis - RMR 1.384 inches, SRO 1.625 inchesMade in USA