So, at around 10K, this can be yours!
http://optics-dealer.com/mk18mod1.html
This is as close to a real gun you're going to get. (When for that kind of money, you could build a RS MK18)
Just goes to show that Japanese airsofters are serious about their game. Honestly, it would be very interesting to take a look at. It seems as it uses a bunch of real parts- LMT stocks, RS DD MK18 RIS, and a bunch of other stuff. It even comes with a Pelican case.