Back in the 1990's when the SVT 40's first began to appear on the surplus market I bought a fair amount of them for resale. The main problem with some of them is that while they looked fantastic on the outside, the chambers on many were bad. I had enough complaints that I quit buying them just before the market dried up.
I have found that countries, such as Russia, where money is in very short supply, will sell off military surplus after it is made to look super on the outside, but questionable on the inside, with no real regard for the end user just to make money the best way that they can.
FR&G