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Mr. Smith, I would definitely not go with a lighter than 23 lb. (stock)hammer spring. Given that weight hammer spring, and the EGW firing pin stops, I think you'll probably be fine with a 20 lb recoil spring. If you end up shooting some of the really hot 10MM fodder, you can change out to a stiffer recoil spring (factory is 23lb equivalent). One of the ways to judge if your recoil spring is too light or heavy is ejection distance. I've found that 6-8 foot ejection distance is about right. If the cases drop at your feet, spring is a mite too stiff, and if you have to walk to the next county to pick them up, well........
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