There is a real one in the milsurp section at marstar, it says sold at $1,300, that's about right for a real one with matching numbers. I have seen the repros offered between $675 and 800. The scopes and mounts are real ones on the repros, $300 to 400 US on ebay alone, add the cost for cutting out the stock and drilling/taping the mount plus a bent bolt ($50 to 100), then the cost of a rifle. It really depends if you can do the work yourself, I decided to buy one which was already built here on the EE.
The mounts and scopes hold zero as they are bolted to the rifle receiver. Adjustment is a bit tricky but I love those scopes and the look.