A note to all Mosin Nagant lovers
Here is the contact info page for Weaver.

http://www.weaveroptics.com/general/contact_us.aspx

The M.N. is the most manufactured bolt action in the history of the world. In fact the NM is the 2nd most manufactured firearm ever made, second only to the AK47 and it's variants.

That being said, I wonder when Weaver is not making side mounts for them. They do make side mounts for SMLEs, 1917 Enfields, Carcanos, Arisakas, Schults&Larsens, Remington M-10s, Krags, Winchester M-42 Pump 410 Shotguns, Cooley m60s and Springfield 1903, -------------------Come on Weaver! Try thinking logically.

Can they possible be so stupid as to think the cost of manufacturing bases for things like 410 pump shotguns is fine, but there is not enough demand for bases for the Mosin? The mosin has been made in the tens of millions. Some estimate that MN has been made close to 100,000,000 and certainly at least 72 millon have been made.

Use the link and let see if we can bury Weaver in requests for this mount. I have used the Weaver side mounts many times in my 46 years of gunsmithing and they are quite good.
If a lot of folks write to them they probably will start making them.