http://www.aliexpress.com/item/Russi...232031095.html
I found this scope kit. Yeah, it's a repro, but when you consider the price of a nagant, and this kit,(do the math) you save money, that is if you're not interested in an original. Sure it takes some work and drilling, but you could have a gunsmith do it and probably still be money ahead. At least you'd know what you have...