Tough as a tank, yet nowhere near as bulky and extremely lightweight, the Scalarworks Sync RMR Mount is a solid platform for anchoring a Trijicon RMR red dot sight firmly to your shotgun's receiver. It's also engineered to sit at the right height for co-witnessing with iron sights. The Sync RMR Mount attaches to your shotgun using four screws and Scalarworks proprietary internal key-slot system. This spreads the recoil force over a larger area to help ensure the RMR doesn't shift. The Sync's water-tight mounting platform does not require a sealing plate between it and the battery compartment on the underside of the RMR. Ultra-light - weighs only 0.7 oz Mfg: Scalarworks