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Swap out the poly mainspring housing on your STI/SV 2011-style pistol with a Dawson Precision metal mainspring housing. These mainsprings housings enable you to customize your grip to your hand as well as alter the weight and overall feel of the grip. The arched MSH is well suited for shooters with larger sized hands. These parts are CNC machined to exact tolerances from stainless steel or blue steel. The stainless and blue steel models will add weight for better balance and more consistent draws. If you're looking for a lightweight arched mainspring housing, check out the aluminum STI model.
