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Mausingfield Scope Mounting

Ted Karagias, President of American Rifle Company informs viewers about the scope mounting interface of the Mausingfield bolt action. Tapered Key Scope Mounting Interface and Choosing the Inclination Angle of the Rail American Rifle Company developed an advanced scope mounting system for the Mausingfield that provides the security of an integrally machined rail and the interchangeability of a removable rail. When a typical rifle is fired, it undergoes high rates of acceleration, on the order of 200 to 300 g’s. Thus, high forces are imparted by the rifle to the scope mounting system that can cause slippage between the two, ultimately resulting in sight misalignment and reduced accuracy. This is especially true if only friction is relied upon to maintain the relationship between the scope mounting system and the receiver, as is predominantly the case with the M700 and many of its clones. A receiver having an integrally machined rail eliminates the possibility of slippage, but in order to fully utilize the available range of elevation adjustment within a scope, a rail must be inclined with respect to the rifle’s bore. But different scopes require different amounts of inclination making integrally machined rails a bit encumbering when selecting a scope. Hence, the connection between the rifle and the scope must be rock solid while affording the shooter the ability to replace one scope for another which may be better suited for a different application. To fulfill these requirements, the Mausingfield receiver has an integral key with tapered walls that engages a similarly tapered slot within the rail. Five commercially available 8-36 x ¼” long socket head cap screws are used to draw the receiver and the rail together. The resulting connection makes slippage between the two nearly impossible providing both security and interchangeability. Mausingfield actions are supplied with a rail, the inclination angle of which must be specified by the customer. To choose the rail angle that will make available most of the elevation adjustment within the scope, determine how much elevation adjustment the scope has, divide that number by two, and then subtract either 15 if working with minutes of angle (MOA) or 4.4 if working with milliradians (mrad or mils). Fifteen MOA is subtracted because approximately 6 MOA must be allocated to obtaining a 100 yard zero assuming the scope is mounted approximately 2” (50mm) above the bore and approximately 9 MOA must be allocated for build tolerances of the rifle, the scope mount, and the scope itself. This is an approximation but it is more than adequate for choosing the rail angle.