Sks's are great guns BUT they can be very dangerous guns too. There are many easy fixes to make them safe. I STRONGLY suggest checking out
www.yooperj.com and go to the safety section on sks's. Also check out his trigger job. Every Sks owner should visit this website and learn about the sks. Also check out utube and search for popped primers on sks's there is a guy on there that explains the issue and a easy fix. Took my yugo to the range last week and there were popped primers all around me I could not figure out what was wrong until i visited the sks survivors board. Many of these fixes are inexpensive and make a nice winter project. A new murrays spring loaded firing pin is a good place to start.