I'd go read the technical details page on the SSS site on this site, and also some tech archive article on bolts. The SSS people can help you out making sure things fit. Use a caliper to measure the firing pin diameter of what you've got, and know those numbers when you call them. There are specific days and times (on their site) when they answer the phone. They aren't alwasy quick to answer email. But when you reach them, very helpful.