http://www.surplusrifle.com/russianm...ifications.asp
It's an M91/30. That price is very very high. Obviously he's advertising it as a WWII rifle and not the actual model number to trick some fool.
I have two M44 (they have short barrels 16in I think and a folding attached bayonet). They are pretty accurate I'd have to say and a blast to shoot, literally. Ammo is dirt cheap, but corrosive.
If you do pick one up and can afford it, pick up an authentic scope. They were used from WWII to Vietnam. Definately adds to the shootability as iron sights can be a bear
ETA.... Link for parts breakdown, great resource
http://7.62x54r.net/MosinID/MosinDisassembly.htm