The extra weight of Glockstore's stainless steel and tungsten guide rods for your Mini-Glock helps the gun shoot better and feel better. You'll be able to shoot faster and more accurately while reducing recoil and muzzle jump. It's a drop-in part with the dual springs included and captured on the rod. And, now you can select the spring weight that is best for you. The Glock is a wonderful gun...we all know that. But some of the parts should be changed to improve performance. This part is more than 50% heavier than the factory plastic part which will help you shoot the gun faster and more accurately because it reduces recoil and muzzle flip. NoteGlockstore Stainless Steel Guide Rods weigh roughly 28 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.