authentic

hi purchased this "oem" scope mount for a 10/22 and it doesn't look like the scope mount that came with my 10/22 (have a couple all the same mounts), this one uses new screws and only 2 screw holes line up.... can anyone tell me if this is a Ruger oem, thanks http://www.ebay.com/...984.m1439.l2649

Ordered a Mosin-Nagant PU rifle from classicfireams.com. They claim the rifle is "Original Russian M91/30 Arsenal Refurbished PU Sniper Rifle with Original Scope and Mount". Well, I really can't tell. Many members here are very knowledgeable. Here're some pictures. Can you gentlemen share your...