The ZEV Technologies Reduced Power Competition Striker Spring is manufactured from superior materials for greater longevity and consistency. Intended to be used with lightened firing pins, such as the ZEV Technologies Skeletonized Ultra Light Firing Pin. Available in 2lb and 3lb spring weights. 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.