Check the listing for details. For Glock 42 43 43X 48 ISMI Competition Trigger Spring Kit Plus 50% Extra Power. Condition: New. Listed at 10.95 USD. For Glock 42 43 43X 48 ISMI Competition Trigger Spring Kit Plus 50% Extra Power This Kit Includes-Qty 1 50% Extra Power Trigger Spring (reduces the pull weight) Qty 1 Reduced Power Safety Plunger SpringQty 1 4lb Reduced Power Striker Spring ISMI Premium Springs are Chrome Silicon which is more superior than traditional music wire springs. These springs have 10x the life of music wire springs, and they hold much better tolerances during compression and cycling. This makes sure the spring function in your firearms is as consistent as possible.This is a great drop in trigger kit is designed to help you fine tune your trigger pull and improves function in competition pistols.This kit is for competition use only not duty use. Disclaimer - "GLOCK" is a federally registered trademark of Glock, Inc. or Glock Ges.m.b.H. GoTo GEAR has NO affiliation in any manner with, or otherwise endorsed by, Glock, Inc. or Glock Ges.m.b.H. The use of the word "GLOCK " on this page is merely to identify which firearm these parts or components are compatible with.