Lone Wolf firing pin spring kit - all three LWD striker spring weights in one pack, so you can tune striker energy to your trigger and ammunition or simply keep spares on hand. The three springs Lightweight (bronze) - the lightest weight Lone Wolf recommends. Gives a very light striker pull, but can produce light primer strikes depending on ammunition. Replace roughly every 6 months. Mid-weight (short, silver) - the best all-round striker spring: lighter than OEM while staying reliable. This is the spring Lone Wolf ships in its own slide builds. Factory weight (long, silver) - mimics the Glock OEM GLO-63 spring; an economical straight replacement. Telling them apart Silver long = factory weight. Silver short = mid-weight. Bronze = lightweight. Fitment note A reduced-power striker spring lowers trigger pull weight but can cause light primer strikes with harder primers. Confirm reliable ignition with your chosen ammunition before relying on any spring change for defensive use. Specifications Three striker springs per kit Manufacturer Part Number: LWD-63-KIT Manufacturer: Lone Wolf Distribution GLOCK is a federally registered trademark of Glock, Inc. and is one of many trademarks owned by Glock, Inc. or Glock Ges.m.b.H. Neither 3CR Tactical nor this site are affiliated in any manner with, or otherwise endorsed by, Glock, Inc. or Glock Ges.m.b.H. The use of "Glock" on this page is merely to advertise the sale of Glock pistols, parts, or components. For genuine Glock, Inc. and Glock Ges.m.b.H products, visit https://us.glock.com . 3CR Tactical is an approved Lone Wolf Distribution dealer. Lone Wolf parts we list are genuine Lone Wolf product, not clones or salvage.