I have the 30mm C1MM in FDE. I can get you the specs upon request. Comes with the manual. Zero rounds down range by me, currently mounted. Also have a 12 o’clock piggy back mount for the Aimpoint Acro P2 in FDE. In original box. Don’t have the arc. Started to build it out then realized I need a non cantilever mount. OBO. Text for faster response, 2)9323995.