Wolffreduced power striker springs are utilized to lighten the trigger pull on Glock pistols. I recommend this part but strictly and only for competitive purposes. This is the 4 pound spring. Fits all Glock models.
177920957Wolff Reduced Power Striker Spring for Glockshttp://cdn.shopify.com/s/files/1/0266/1345/products/firing_pin_spring_large.jpg?v=1475781592https://cpwsa.com/products/wolff-reduced-power-firing-pin-spring-for-glocks3.50USDW.C. Wolff CompanyInStockGlock Specific PartsGun Springs