ISMI Competition Spring Kit for Glock GEN 1-4

Designed to fit Glock Gen 1-4 Models: G17, G17L, G19, G20, G20SF, G21, G21SF, G22, G23, G24, G26, G27, G29, G29SF, G30, G30SF, G30S, G31, G32, G33, G34, G35, G36, G37, G38, G39, G40, G41.


ISMI Have manufactured Recoil Springs for Glocks for years now. Now there awesome spring technology is available for your trigger and striker internal springs.

ISMI Premium Springs are Chrome Silicon which is more superior then 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.

With the correct combination of trigger connector and springs a user can decrease a trigger pull to as low as 2.5 to 3.0 lbs on average

Included in the Premium kit:

• 3 Drop In springs
• 4lb Reduced Power Chrome Silicon Striker Spring
• Reduced Power Chrome Silicon Safety Block Plunger Spring
• 6lb Extra Power Chrome Silicon Trigger Spring (Extra power reduces the pull weight)
• Please Note: Fitment for the Striker Spring can vary in Generation 4 Glock Models
• Warning: This kit is for competition use only - not for duty use.

ISMI Premium Springs are manufactured exclusively with certified aerospace specification alloys; stainless or chrome silicon. Then their springs are heat treated, shot peened and stress relieved after winding to enhance performance and durability. Chrome silicon springs have 10x the life of traditional music wire springs, and they hold much better tolerances during compression and cycling.

These springs utilize the same design and manufacturing technology as used in IndyCar and Formula One racing. In a typical 500 mile race, a valve spring in an IndyCar will go through more than 2,500,000 compression cycles. Consideration of factors such as modulus, wire diameter, mean diameter, active coils, total deflection, spring relaxation, maximum service temperature, and operating environment, results in you having modern spring technology available for your pistol.

Note: NDZ always recommends any part be installed by a qualified and trained gunsmith. NDZ promotes the use of safety practices and gear when working on any firearm.