When I used to work at an outdoor store I was responsible for most of the surplus gun buying. In a lot of Yugo 59's one came in that had a nicely figured walnut stock and it was threaded on the muzzle. I took a slant brake off an AK and it fit perfectly. My question is what would the muzzle be threaded for and how common is it to find them like this. I will include the pictures of the threads and the rifle.