It’s best to contact them. The firing pin is threaded into the cocking piece and has a small set screw in it. Once you get the set screw out hold onto the shroud and use a small wrench to turn out the firing pin. Be careful it’s under pressure from the spring. Once it’s out it will all come apart. When you go to put it back together you need .055 to .060 pin protrusion when it’s dropped. Use a light bit of loc tight on the set screw when you put it back in. Oh and when you try to take the set screw out use a bit of heat first.Hi, want to replace the striker spring of my KS action latest gen mod, I have a firing pin removal tool , however KS firing pin assembly doesn’t have threads to attached to my removal fixture, thanks