I bought a used Stainless Rem 700 Light Varmint, .223 Rem and had problems with light firing pin strikes and cratered primers using both factory and handloads. I took it back to the dealer and they replaced the bolt end cap, but that didn't do anything. It was then sent to a Remington Repair Center and they declared it a "dangerous gun", but didn't do anything to it. One day, I noticed that Remington was having a parts sale, I think it was 30% off, and it included blued firing pin assemblies, complete with end caps, so I bought one and installed it in the Stainless rifle. Now it works wonderfully and is even more accurate than it was. It's a real joy, both at the range and carrying in the field, even though it looks a little different.