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 S&W 6904/4006 series XP magazine springs 3 pak $34.97 Smith & Wesson M&P .45 Guide Rod & Recoil Spring 16lb. $54.97