I saw an M77 RS Hollow Bolt in 7mm Rem Mag today at a shop. The stock wasn't in the best of shape, the exterior metal was extremely good, but inside the barrel was questionable. I could see a little rust inside the end of the barrel. Looking into the barrel there appeared to be corrosion/putting for about one quarter of the way from the breech end. I did not have cleaning supplies to run through the barrel. The serial number was 70-3xxxx and the price was $360. I might go back and see if I can run a bore snake through it...