The Leupold 49952 is a high-end alternative to ringmounts sold by firearms manufacturers, specifically designed for firearms with unique integrated mounting systems. This product offers a no-tap mounting method suitable for most .22 rimfire rifles equipped with an 11mm, 13mm, or 3/8\" dovetail rail.The distinct feature of Leupold ringmounts is the superior integrity and closer tolerances enabled by precision machining from solid stock. For need of additional fore and aft ring spacing, extension rings which provide an extra 5/8\" are also available.