Your bolt might just need a cleaning, my Remington 541-s also started to misfire. The problem was the oil and crud around the firing pin just slowed its impact down a bit, but after a good cleaning it works like new now but I did have do dissemble it to clean it properly. Clean all crevices completely you can use a toothpick to get at tight areas. Make sure as in the posts above the pin, spring or barrel surface where the firing pin would strike is not damaged. Here is a link if you have to take your bolt apart to inspect/clean it.