The Glockstore Heavy Tungsten Guide Rod offers added weight that helps reduce much of the felt recoil and also makes the gun function better, returning the slide more consistently and thereby improving overall accuracy! Roughly 15 pound tension weighing 52-58 grams. NoteGlockstore Heavy Tungsten Guide Rods weigh roughly 52-58 grams as compared to stock guide rods which weigh between 12-16 grams. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.