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.
Shop Recoil Spring for your Glock 21 Gen 3? Browse this part at NDZ Performance — ships from the US with fast processing.
| Part SKU | Part Name | Firearm Model | Compatible |
| ISMI-RS-13 | ISMI Glock Gen 1-4 Recoil Spring 13 lb Full Size | Glock 21 Gen 3 | Yes — Verified |
Get Yours from NDZ Performance
Precision-machined in the USA. Ships fast. View ISMI-RS-13 on NDZ Performance
Remove the slide, swap the spring and reassemble. It’s that simple.
This spring fits Gen 1-4 full-size Glocks, including Gen 3.
You receive the ISMI 13 lb recoil spring only. Springs are sold individually.
ISMI-RS-13 is 20% lighter and offers smoother cycling than OEM springs.
Ready to upgrade your Glock 21 Gen 3? Get your Recoil Spring at NDZ Performance and experience the difference quality aftermarket parts make.