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recoil spring weight

  1. Proper Recoil Spring for STI 9mm

    I'm trying to solve an issue with a friends STI 9mm pistol. It's a DVC Open model, and I have zero experience with these pistols.... What the prob is, is it fails to cycle properly when firing 9mm minor ammo. He has an eight pound recoil spring installed right now, and is thinking a heavier...