Recoil Spring for Glock 21 Gen 5 – Compatibility Guide

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Recoil Spring for Glock 21 Gen 5 – Compatibility Guide

Why upgrading your recoil spring matters for the Glock 21 Gen 5

The Glock 21 Gen 5 is a workhorse. Known for its power and reliability, it’s a favorite for duty and competition. With its robust .45 ACP chambering, it’s a force at the range or in a defensive scenario. Shooters upgrade the recoil spring to improve reliability and performance. A quality recoil spring ensures smoother cycling and reduced felt recoil. NDZ’s recoil spring offers superior durability and consistent performance, precision-machined for better action than the factory version.
Part SKU Part Name Firearm Model Compatible
ISMI-RS-13 13 lb Full Size Recoil Spring for Glock Glock 21 Gen 5 Yes — Verified

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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.