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JimDee, I don't really have a lot of advice on the 45S. I have never built one. I haven't wanted one for myself and haven't been asked for one by a customer. The Springco system works on a variable spring. The harder the slide comes back the more resistance the spring provides. It also adds about an ounce and a half to the weight. I would have to give the firing pin stop some thought but it sounds like your on the right track. Stock stops are radiused at the bottom to allow free travel of the slide as the hammer is cocked. A squared surface would offer more resistance. I think you should install it as usual and maybe just break the shapr corner. But I hope that someone who has built one will respond to your question with a little more athorative insight. George
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