Rear Plate for Glock 21 Gen 4 – Compatibility Guide

1 min read

Rear Plate for Glock 21 Gen 4 – Compatibility Guide

Why upgrading your rear plate matters for the Glock 21 Gen 4

The Glock 21 Gen 4 is a reliable powerhouse. It’s a favorite for duty and competition, thanks to its robust design and impressive capacity. You know it’s a beast, but every beast can be tamed.

Upgrading your rear plate increases reliability. It enhances your Glock’s performance and durability. NDZ’s rear plate for the Glock 21 Gen 4 is CNC-machined, made in the USA, and offers a better fit and feel than OEM. We engineered it for precision and longevity.

Shop Rear Plate for your Glock 21 Gen 4? Browse this part at NDZ Performance — ships from the US with fast processing.

Part SKUPart NameFirearm ModelCompatible
GLK-SP05865Glock OEM Gen 1-5 Armorer’s Half Rear Plate ORGGlock 21 Gen 4Yes — Verified

Get Yours from NDZ Performance

Precision-machined in the USA. Ships fast.

View GLK-SP05865 on NDZ Performance
How do I install the rear plate on the Glock 21 Gen 4?

Installation is quick. Remove the slide, align the plate, and snap it into place.

Is the rear plate compatible with other Glock generations?

No, the GLK-SP05865 is verified for Glock 21 Gen 4 only.

What’s included with the NDZ rear plate?

You’ll receive one precision-machined rear plate ready for installation.

How does this rear plate compare to the OEM version?

Our rear plate offers superior fit and finish, CNC-machined for durability.

Ready to upgrade your Glock 21 Gen 4? Get your Rear Plate at NDZ Performance and experience the difference quality aftermarket parts make.

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.