Audere PSR Scope Rings 30mm Tube Low Black. In this latest generation this series sees improved reliability under stress conditions and the addition of a recoil lug a bubble level a new one-screw clamping system which speeds up the assembly. Specifications for Audere PSR Scope Rings: Manufacturer: Audere Color: Black Package Contents: Audere Scope Rings Psr 30mm Low Black Audere PR0005: PSR Scope Rings 30mm Tube Low Black