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Shield Arms built its reputation on rethinking how a simple magazine extension should work, and this +5/+4 unit for the Glock 17, 19X, 22, 34, 35, and 45 is a good example of that thinking in action. It bolts onto your OEM 17-round 9mm magazine for 5 extra rounds, or a 15-round .40 S&W magazine for 4 more, without asking you to buy a whole new magazine body. The red anodized finish makes it easy to spot in a range bag or pouch, and it still machines down to the same tight tolerances as their standard colors.
Every Shield Arms magazine extension starts as a solid block of 6061 aluminum, machined down rather than cast, which is part of why these hold up so well under regular range and competition use. The Type II anodized coating adds a layer of corrosion resistance on top of that, so the red finish stays sharp instead of wearing dull after a season of reloads. Machined index cuts run along the body too, giving you a little extra purchase when you're grabbing a mag out of a pouch mid-stage or mid-string.
Most magazine extensions make you strip the whole unit off the magazine just to clean the spring or swap the follower. Shield Arms flipped that around with a removable floor plate that separates from the extension body on its own, so field maintenance takes a couple minutes instead of turning into a project. It ships with a +10% power spring built specifically for the added capacity, so feeding stays consistent instead of getting lazy near the bottom of the stack.
This extension is sized to work with most aftermarket flared magwells and comes in at the USPSA 141.25mm length spec, so it's a reasonable option whether you're loading mags for a match, duty use, or just want more rounds on the shelf. It's built for OEM 17-round and 15-round Glock magazine bodies only, and installation is straightforward with basic tools. Shield Arms backs it with a lifetime warranty and their Spring for Life program, so if the spring ever wears out from heavy use, they'll send a replacement.
No, this particular extension is built for the full-size Glock 17, 19X, 22, 34, 35, and 45 magazines, which use the 17-round 9mm or 15-round .40 S&W body. Glock 19 and 23 magazines are a shorter body and need the compact-frame version of this extension instead.
Yes, it comes with a +10% power spring designed for the added capacity, so you don't need to source a spring separately. Using the included spring instead of the factory one helps keep feeding reliable once the mag is holding more rounds than it was built for.
That's actually one of the main selling points here. The floor plate is designed to come off on its own, so you can access the spring and follower for cleaning or inspection without disassembling the entire extension from the magazine body.
It's designed to work with most aftermarket flared magwells on the market, so pairing it with a magwell for faster reloads shouldn't be an issue. It's also cut to the USPSA 141.25mm length spec, which matters if you're loading mags for competition.
| UPC | 853465008476 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | G17-ME-5-RED |
| Caliber/Gauge | 9mm |
| Capacity | 5 |
| Color | RED |
| Model | |
| Product Type | Magazine Extension |
| Shipping Weight | 0.15 |
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