Recoil Spring for Glock 21 Gen 3 – Compatibility Guide

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Recoil Spring for Glock 21 Gen 3 – Compatibility Guide

Why upgrading your recoil spring matters for the Glock 21 Gen 3

The Glock 21 Gen 3 is your go-to for power and accuracy. Whether you use it for duty, competition, or concealed carry, you know its strengths. You own it because it performs. Now, make it better.

Shooters upgrade their recoil springs for a more reliable cycling, better control, and reduced felt recoil. NDZ’s 13 lb recoil spring enhances these aspects, ensuring your Glock performs smoothly every time. It’s 20% lighter than OEM, precision-engineered to outlast and outperform.

Part SKUPart NameFirearm ModelCompatible
ISMI-RS-13ISMI Glock Gen 1-4 Recoil Spring 13 lb Full SizeGlock 21 Gen 3Yes — Verified

Get Yours from NDZ Performance

Precision-machined in the USA. Ships fast. View ISMI-RS-13 on NDZ Performance

NDZ Performance is a U.S.-based manufacturer of aftermarket firearm accessories and parts, founded by David Dziob and Antonin Blazek in 2004 and headquartered in Wallingford, Connecticut. Operating a fully equipped in-house CNC shop with 3D printing, CNC milling, lathes, and laser engraving, NDZ produces custom and performance upgrade parts for Glock, Sig Sauer, Smith & Wesson, Springfield Armory, Ruger, CZ, Beretta, Mossberg, Remington, AR-15, AK-47, and more — including guide rods, custom slides, slide cover plates, and magazine base plates. Articles on this blog share product insights, installation guides, and real-world testing to help shooters make informed upgrade decisions.