Looks like a proto type - SiOnyx Picatinny Rail Mount for Aurora Digital Night Vision Monoculars

First of all, it's extremely heavy. Could have used a different alloy or at least skeletonized it. To much-added weight to put a firearm for any practicality. With the SiOnyx mounted there is no way to change batteries. The release lever is blocked for no reason. The mounting screw is not attached and is really easy to lose when not mounted to the Sionyx. Lots of better options for mounting screws available using shoulder screws with swivel-like heads on most photography accessaries. I have not even checked to see if it co-witnesses sights yet. Extremely overpriced for a block of metal. looks like I will be going to eBay for other options. I do not reccomend