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 4.6" models only, in 10mm.  Does not fit compact or .45 models.  Will not work with factory recoil springs.   Recommended for use with ISMI flat wire M&P springs.

ISMI M&P Recoil Spring

.74 oz