NDZ Reduced Power Guide Rod Kit GEN 4 for Glock 20 20SF 21 21SF

Designed to fit Glock Gen 4 Models: G20, G21, G40, & G41.

Does Not Fit: Glock Gen 1-3, or Gen 5 Models.

Optimize your Glock’s recoil system for faster recovery and precision control with the NDZ Reduced Power Guide Rod Kit for GEN 4 Glock 20, 20SF, 21, and 21SF models. Designed for serious shooters, this drop-in kit eliminates factory guide rod flex while giving you multiple recoil springs to match your spring weight to your specific load and application. The rigid stainless steel guide rod enhances lock-up and consistency under recoil. A black anodized Gen 4 adapter ring ensures proper fitment and alignment, while the interchangeable ISMI recoil springs let you fine-tune for competition, reduced-power, or custom barrel setups.

Included in this Kit:

• 1 - Black Anodized Steel Gen 4-5 Guide Rod Adapter.
• 1 - Stainless Steel Guide Rod with hardware.
• 1 - 3/32" Allen Wrench.
• 1 - 11 lb. ISMI Reduced Recoil Spring.
• 1 - 13 lb. ISMI Reduced Recoil Spring.
• 1 - 15 lb. ISMI Reduced Recoil Spring.

Features:

• Rigid stainless-steel body eliminates guide rod flex for improved lock-up.
• Hex screw removable tip allows easy spring swaps.
• Adapter ring ensures proper fit and spring alignment for Gen 4 frames.
• ISMI springs made from aerospace-grade stainless and chrome silicon.
• Springs are heat treated, shot-peened, and stress-relieved for durability.
• Drop-in install, no gunsmithing required.
• Made in the USA by NDZ Performance.

Glock Factory Recoil Spring Weights by Model:

• Glock Models: G17, G20, G21, G22, G24, G31, G34, G35, G37, G40, G41 - Factory Stock Spring weight is 17 lbs.
• Glock Models: G19, G19X, G23, G32, G38 - Factory Stock Spring weight is 18 lbs.

What Recoil Spring Weight do you Need?

• 11 - 13 lbs. Springs: Typically used for Competition Shooting, or when using a Recoil Compensator with Barrel. A lighter weight Recoil spring allows for a faster recoil time. This allows the shooter to stay on target longer and makes target re-acquisition, Faster and Easier.
• 16 lbs. Springs: For Reduced Power Ammunition Loads.
• 17 - 18 lbs. Springs: Factory Weight.
• 19 - 24 lbs. Springs: For Heavy Power Ammunition Loads +p or +p+.

Please make sure you are using the correct loads for the springs or you will have cycling issues.

See our complete line of Glock Gen 1-4 Products here

NDZ Performance is a USA Manufacturer of High Quality Aftermarket Accessories. Proudly made right here, in our facility, to the Highest Quality Standards with a Lifetime Warranty against Manufactured Defects.

Important: We recommend the use of Blue Loctite on the hex screw threads when switching out springs. This will provide a firm hold and still allow easy removal when necessary.

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.

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.