Stainless Steel Guide Rod for Smith & Wesson M&P 9/40 4.25"
Designed to allow you to run different weight springs with the added weight and strength of solid stainless steel. This is not a captured guide rod and is for the 4.25" models only, in 9/40/357. Does not fit compact or .45 models. Will not work with factory recoil springs. Recommended for use with ISMI flat wire M&P springs, may not work with round wire springs.