Smith & Wesson 6906, Firing Pin Safety Plunger Spring, Used, Excellent $5.00 Excellent condition, used firing pin safety plunger spring, for a Smith and Wesson 6906. In stock Smith & Wesson 6906, Firing Pin Safety Plunger Spring, Used, Excellent quantity Add to cart Category: Smith & Wesson Related products Smith & Wesson M&P 9mm .40/.357 Recoil Spring 16lb. $14.97 Smith & Wesson M&P 9mm .40/.357 Recoil Spring 19lb. $14.97