Russian surplus scopes/PSO scopes?

[HoLeChit]

I'm looking to put a Russian surplus side mount style scope on a rifle I'm looking to buy soon, I'm planning on buying this: https://www.atlanticfirearms.com/co...54r-iron-wood-stock-2244-detail.html?Itemid=0 and I want to put a 1000m dragunov reticule scope on it. However, aside from using them, I know nothing about them. I know kalinka sells them, however they really seem to have a hard time keeping them in stock. I really want a Russian scope on my Russian rifle. Where would be a good place to look? Things to look for? How accurate/capable of holding a zero are they? Anywhere in OKC I can maybe look at hold one for myself?