Back Up Iron Sights - PMM Independent Drop-In Rear Sight for Trijicon RMR

This Independent Drop-In Rear Sight (IDRS) from Parker Mountain Machine is the most low-profile and least obtrusive rear iron sight on the market. Small enough to be there when you need it, and barely noticeable when you dont, the IDRS mounts directly to your Trijicon RMR. This rear sight requires the following front sight heights: Direct milled slides at industry standard .125'' deep requires a .350'' tall front sight. Glock MOS with industry standard .100'' thick optic plates require a .390'' tall front sight.