M3 Magazine Spring
The M3 Magazine Spring from United Defense is a mil-spec replacement spring for the iconic M3/M3A1 Grease Gun magazine in .45 ACP. Produced during a recent run of United Defense M3 magazines, these springs are made from hardened steel wire and deliver the correct tension to feed a full 30-round stack reliably. Drop one in to revive a tired Guide Lamp, Ithaca, or other USGI surplus magazine with weak or set springs. A must-have spare for Grease Gun collectors, M10/45 shooters, and anyone running original WWII-era .45 ACP subgun magazines.
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- SKU
- GGMS
$6.95
- Buy 2 for $6.26 each and save 10%
- Buy 3 for $5.91 each and save 15%
- Buy 5 for $5.21 each and save 25%
Description
Features
- Mil-Spec Construction — Built to original military specifications for the M3/M3A1 Grease Gun magazine.
- 30-Round Capacity Tension — Engineered to deliver consistent feed pressure across a full 30-round .45 ACP load.
- Hardened Steel Wire — Heat-treated spring steel resists fatigue and set, even after extended use.
- Direct Drop-In Fit — Designed to replace worn or tired springs in USGI Guide Lamp, Ithaca, and current-production United Defense M3 magazines.
- Restores Reliable Feeding — Brings sluggish, sticky, or short-stroking surplus magazines back to dependable function.
- Fresh Production Run — Produced alongside a recent run of M3 magazines, so you're getting a current, full-strength spring rather than decades-old surplus.
- Sold Individually — Order one spring per magazine you intend to refurbish.
- M3/M3A1 Platform Compatible — Works in any firearm chambered to accept unmodified M3 Grease Gun magazines, including .45 ACP subgun builds.
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Customer Reviews
Top customer reviews
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7 bucks to bring a 70 year old mag back to lifeIf your running original USGI M3 mags and lets be honest most of us are because thats all there was for decades the springs are probably tired. Mine were. I was getting failures to feed in the last 5-6 rounds of every mag because the springs just didnt have the juice to push the follower up anymore. Swapped in these mil-spec replacement springs and the difference was night and day. Full 30 round mag dumps with zero feeding issues. The corrosion resistant finish is a nice touch too since the inside of a .45 ACP mag gets exposed to a lot of moisture and carbon. At $6.95 per spring theres no reason to keep nursing a weak spring when you can just replace it. Grabbed 5 at the 25% bulk discount and did all my mags in one sitting.
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