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.40 S&W Compact Shooters


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I have an STI VIP and want to find a spring combination that lets me shoot a minor load. I installed the 9mm Recoil Master spring and tried 200, 180, and 165 grain BBs I but I still can not get below 145 PF without short cycling the slide. A lighter mainspring and one piece guide rod are on my list, but I would like to flatten the learning curve. Any suggestions?



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