Reptilia LLC 100240 AUS Optic Mount Black 7075-T6 Aluminum 34mm Tube Mil-Spec 1913 Picatinny Rail MountIntroducing the 1. 70 inch bore height AUS Mount for 34mm diameter magnified optics, from Reptilia. Driven by the request of an end user group, the AUS Mount is the culmination of a 2 year development program. Like the DOT Mount line the AUS Mount attaches to any M1913 Picatinny rail via our anti snag spring loaded nitride steel clamp and custom bolt mounting system which can be tightened with a T 25 Torx or a flat blade driver to sit flush with the