AGP Arms Glock 21 Extra Power Spring

SKU:
AGP-GLK-45SPRING
$7.25
Bulk Pricing:

Below are the available bulk discount rates for each individual item when you purchase a certain amount

  • Buy 5 - 100 and get $1.00 off
(13 reviews)
Current Stock:
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AGP Arms +20% stronger spring for the Glock 21 factory 13 round magazine. This spring will work in a factory magazine and magazines with +3 extensions. Upgrade your worn out and weak factory spring today.

Dealer Inquiries Welcome for 100+ Qty.

$7.25ea for Qty 1-4
$6.25ea for Qty 5+

Reviews

  • 5
    STOP!!!!

    Posted by Brian.c on 3rd Jun 2026

    If you have a Glock 30 gen 5 and plan on using Glock 21 oem mags you need this upgrade!!. I find the spring pressure inadequate to feed the short slide of the g30 you will get FTF and double feed issues with oem springs. I will be leaving a video review on this product on YouTube soon as I get my Glock store blue slushy. This store saved my Glock ??

  • 5
    G21 extra power mag spring

    Posted by DiscountDave on 24th Feb 2026

    I run .40 Super through my G21. It has a high slide travel rate, and factory springs aren't strong enough for reliable feeding. These dropped right in, increased the feed pressure and solved the issue.

  • 5
    Power Spring

    Posted by L Peal on 19th Sep 2025

    Replaced the OEM springs with these and added an extension. Works great and no issues.

  • 5
    Glock Mag springs

    Posted by Dennis Gregory on 18th Apr 2025

    Upgraded my Glock 21 for a 460 Rowland conversion.

  • 5
    +20 mag springs

    Posted by Stephen on 24th Sep 2024

    Fast shipping and a good price.

  • 5
    Ensures feeding with .45 super

    Posted by Chris from PA on 25th Apr 2024

    I bought these because .45 Super will operate the slide a little bit faster than regular magazine springs are designed for. I bought three springs to try out, and they work as advertised. One note; these springs are for a newer revision of Gen 3 magazines- I had one where the spring hooked in directly to the follower, whereas the AGP springs are designed to slip fit around the follower's base.

  • 5
    G21/41 replacement mag springs

    Posted by Joel Tajan on 30th Nov 2023

    Great replacement springs, I felt the difference while loading/unloading the magazine.

  • 5
    Glock mag springs

    Posted by Kenneth M on 12th Sep 2023

    These springs were exactly what I needed to make my Model 21 feed .45 Super reliably

  • 5
    Magazine Springs

    Posted by Daniel on 11th Jan 2022

    I put plus 2’s on my Glock 41 magazines. The OEM spring still worked but lost a good amount is resistance. Ordered the Glock 21 extra power springs. They’ve been flawless. Definitely gonna order more for spares. Plus my order was completed and shipped in less than 24 hours. Awesome job.