The G17/G18/G34 31/33-Round Magazine Spring – Part #100700084 is a high-reliability replacement spring designed specifically for extended-capacity 9mm Glock-pattern magazines. Whether you’re running a factory-style 31- or 33-round mag in your Glock 17, Glock 18, Glock 34, or compatible platforms, a strong, consistent mag spring is critical for dependable feeding—especially when the magazine is fully loaded.
If your extended Glock magazine is failing to lock the slide back, nose-diving rounds, or struggling to feed the last few cartridges, it’s time to refresh it with a new 31/33-round magazine spring.
Built for Extended 31- and 33-Round 9mm Glock Magazines
This magazine spring is purpose-built for 9mm double-stack Glock extended mags:
Compatible with G17 31/33-round magazines
Compatible with G18 31/33-round magazines
Compatible with G34 31/33-round magazines
Designed for standard double-stack 9mm Glock pattern extended magazines in the 31–33 round range
It’s the ideal replacement when your original spring has weakened from age, heavy use, or storage while fully loaded.
Restore Reliable Feeding in High-Capacity Mags
Extended magazines put extra stress on the spring, especially when stuffed to full capacity. Over time, that can lead to:
Dropping in a fresh G17/G18/G34 31/33RD magazine spring helps:
Restore crisp, positive feeding from the first round to the last
Maintain reliable slide lock-back after the final shot
Support higher round counts with fewer magazine-related malfunctions
If you depend on extended mags for range work, training, competition, or home defense, keeping strong mag springs is non-negotiable.
Durable Spring Steel Construction
The 31/33-round Glock magazine spring 100700084 is made from quality spring steel engineered for:
Consistent tension over thousands of compression cycles
Resistance to set and fatigue when used and maintained properly
Reliable performance in high round count training and extended shooting sessions
A robust magazine spring is the heart of a reliable extended mag—this replacement is built to keep your rounds feeding smoothly.
Perfect for Duty, Competition, and Range Use
Extended 31- and 33-round magazines are popular in a wide range of setups, and this spring is ready for all of them:
Competition shooters who rely on extended mags for USPSA, 3-Gun, or local matches
Range enthusiasts who enjoy high-volume practice without constant reloads
Home defense and duty users who want maximum capacity with dependable feeding
Pistol caliber carbine (PCC) users running Glock-pattern mags who need consistent reliability in long mags
No matter how you use your Glock 17, Glock 18, or Glock 34 extended magazines, a fresh spring keeps them running at their best.
Easy Drop-In Replacement
Replacing your old spring with the G17/G18/G34 31/33RD Magazine Spring 100700084 is straightforward:
Disassemble your extended Glock-pattern magazine.
Remove the old spring and follower.
Install the new spring (maintaining proper orientation) on your follower.
Reinsert the spring and follower, then reinstall the floorplate.
With basic magazine disassembly tools and a few minutes, you can dramatically improve the reliability of your mag.
Ideal to Keep as a Spare or in Your Armorer’s Kit
Because mag springs are wear items, it’s smart to have replacements on hand:
Keep a few springs in your range bag or gear box as insurance.
Add them to your armorer’s kit if you maintain multiple Glock pistols.
Refresh older mags on a rotating schedule to prevent surprises at the range or in a defensive situation.
At this price point, it’s an inexpensive way to protect the performance of your extended magazines.
Key Features – G17/G18/G34 31/33RD Magazine Spring 100700084
Part Number: 100700084
Type: Replacement magazine spring
Compatibility:
Glock 17 31/33-round magazines
Glock 18 31/33-round magazines
Glock 34 31/33-round magazines
Other Glock-pattern 9mm double-stack extended mags in the 31–33 round range
Caliber: 9mm double-stack Glock pattern
Material: High-quality spring steel
Function: Restores proper tension and feeding in extended-capacity magazines
(Always verify local laws regarding ownership and use of extended-capacity magazines.)
Why Choose the G17/G18/G34 31/33RD Magazine Spring 100700084?
This extended magazine replacement spring is a great choice if you:
Run 31- or 33-round Glock pattern magazines and want maximum reliability
Have older extended mags that fail to feed or lock back consistently
Shoot often enough that you understand how critical fresh mag springs are
Want a simple, affordable upgrade that can significantly reduce malfunctions
If you depend on extended-capacity Glock magazines, don’t let a worn-out spring be the weak link. The G17/G18/G34 31/33RD Magazine Spring 100700084 is a smart, low-cost way to keep your mags feeding smoothly and your pistol running strong.
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