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Leupold specifically designed this Mark 4 IMS (Integral Mounting System) for tactical applications. It includes a Mark 4 IMS Integral Base and a Mark 4 IMS 30mm Integral Ring Insert and features a monolithic, cantilever design that provides strong and durable support for your riflescope in the most challenging conditions. The integral base and rings are forged from a single-piece of steel for improved durability and strength. It securely attaches to the Picatinny/Weaver rails of most AR and other tactical rifles.