Improved SKS firing pin...

With the slam fire concern. I have fired approximately 100 rounds of hand loaded ammo for my floating pin equipped SKS. I used Winchester large rifle primers and had no slam fires yet.
 
Never had a single problem with my '56 Russian SKS until I installed a Murray's pin. The pin caused a lip to form on the bolt face and caused countless FTF's with Czech surplus 7.62x39. Once I removed the burr caused by the pin, and reinstalled the original russian pin, I haven't had anymore problems. My pin is sitting deep in the parts pin and will probably stay there forever. If it ain't broke, don't fix it! My friend had the exact same problem brought on by the "improved pin" as well. Unless you are only ever going to shoot commercial stuff, I'd save your money and buy a recoil buffer and a ventilated hand guard if you must tinker with the original design of the rifle.
 
A spring-loaded firing pin is NOT necessary for the SKS once you do one thing: disassemble the bolt and get all the cosmoline out of there.

The Soviets went away from the spring-loaded firing pin once they saw that it wasn't needed if the firing pin channel was kept clean and dry.

Slam fires or bump fires are caused by one thing in a stock SKS - a sticky firing pin. Keep the pin and pin channel clean and you won't have any problems.
 
Slam fires are a user error, the error being failure to clean. Slam firing is still possible with a spring. If the pin rattles in the bolt you're good to go, it couldn't be simpler. If it doesn't rattle, clean and inspect it better. That is the one and only fix for slam fires. Spending $40 on a spring to fix a problem that doesn't exist is total lunacy.
 
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