Slide Lock Lever for Glock 21 Gen 4 – Compatibility Guide

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Slide Lock Lever for Glock 21 Gen 4 – Compatibility Guide

Why upgrading your slide lock lever matters for the Glock 21 Gen 4.

The Glock 21 Gen 4 is a powerhouse, favored for duty, competition, and even some concealed carry work. Serious users count on it for its reliability and strength.

Upgrading the slide lock lever gives you more control during reloads and improves firearm handling. The NDZ slide lock lever is CNC-machined for enhanced durability and precision. It offers a better grip and smoother operation than the factory part. Lighter and more responsive.

Part SKU Part Name Firearm Model Compatible
JEN-ESLL-17-BLK Jentra Glock Gen 1-4 Extended Slide Lock Lever Black Glock 21 Gen 4 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.