The Trijicon RMR®/SRO™ Low Weaver Mount Quick Release features a Mil-Spec drop test rated 7075-T6 aluminum design, with an easy to use one-handed toolless mounting system. This Return to Zero mount boasts a low weight and low profile design, compatible with any Weaver rail.Designed specifically for the Trijicon RMR. This lightweight Low Weaver mount is perfect for mounting the RMR/SRO on any weapon platform with a Weaver rail that requires a low optical height. Such as a shotgun, .22 rifle or pistol platform. Distance From Top of Mounting Rail to Optical Axis:RMR: 0.923"SRO: 1.164"