Unique to the M3 patent pending design is a hinge on one side and an overlapping interface on the other used to secure the scope. The hinge minimizes the number of screws used to clamp the scope. The overlapping interface stems from the placement of those screws, which is critical to securing the scope without damaging it. The screws are tangent to the scope tube so that when tightened, the ring cap is pulled down over the scope tube without bending in a way that will damage the scope.
American Rifle used finite element analysis (FEA) to engineer a scope ring that optimally distributes clamping forces over the scope tube. A force of 500 pounds* was applied at each screw location during the analysis to simulate the forces imparted by the screws. As depicted in the resulting stress plots below, the M3’s tangential scope clamp evenly distributes the clamp forces over the tube. As a result, no significant stress concentrations are present on the scope tube.
In stark contrast, all other rings use screws which are offset from the scope tube by some distance. FEA was used to visualize the stress within the scope tube caused by forces imparted by these offset screws. Again, a 500 pound force was applied at each screw location during the analysis. The resulting stress plots show the stress concentration (red) present within the scope tube near the joint between the upper and lower parts of the ring assembly. The forces imparted by the offset screws drive the proximal corner of the ring cap into the scope tube causing the stress concentration. This can indent the scope tube or mar its finish. Furthermore, when the rings of these mounting systems are misaligned with respect to one another, the stress concentration can be further intensified.
American Rifle’s M3 Scope Mount is engineered to provide a comprehensive scope mounting solution. No other scope mount can provide as tight a grip without damaging the optic.