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The Shield Arms +5/+4 extension transforms your standard Glock magazines into higher-capacity platforms without sacrificing reliability or ergonomics. Whether you're running a 17, 22, 34, 35, 19X, or 45, this straightforward upgrade adds meaningful firepower—five rounds on 9mm tubes or four on .40 S&W—paired with a beefier spring that keeps everything feeding like it should.
Build and Design
Machined from 6061 aluminum billet and finished with Type 2 anodizing, the extension is built to handle whatever you throw at it. The gray finish resists scratches and holds up through range sessions, training, or duty use without losing its professional appearance. Machined index cuts along the side give your hand something positive to grip when stripping the magazine from a pouch, which matters more when you're moving fast.
Shield Arms ditched the over-complicated approach here. Unlike extensions that force you to remove the whole thing just to service a spring or follower, this one features a floor plate you can access without pulling the extension off the magazine body. That saves time and frustration when you're doing field maintenance or just want to refresh an old magazine.
Proudly made in the USA, this extension comes backed by a 100% lifetime warranty and Shield Arms' Spring for Life guarantee. That level of backing speaks to the engineering and quality baked into the product. The included +10% power spring handles the extra capacity without creating feeding issues, and it's compatible with standard OEM Glock magazines as well as most aftermarket flared magwells on the market.
This extension is designed for OEM Glock 13 and 15-round magazines from models 17, 19X, 22, 34, 35, and 45. It won't fit aftermarket magazines like Magpul or ETS. Before ordering, verify you're running factory Glock magazines, and check that they're the standard full-size tubes—restricted or modified magazines may have fitment issues.
Installation is straightforward. You'll remove the factory floor plate and spring from your magazine, then install the extension with the included upgraded spring. Most people can handle this in minutes without special tools, though having a vise or clamp can make removing the factory plate easier since it's typically pretty tight.
The +10% power spring that comes with the extension is engineered specifically for the added capacity and has a solid track record for reliable feeding. The upgrade ensures proper tension to feed the extra rounds without creating jams or failures. After installation, run a function test—load and unload the magazine fully several times to confirm everything works smoothly before relying on it.
Yes, this extension fits most aftermarket flared magwells designed for standard Glock magazines. However, compatibility can vary by brand and design, so verify your specific magwell will accept it if you're running something less common. If you're pairing it with Shield Arms Carry or Premium Magwells specifically, you're good to go.
| UPC | 853465008483 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | G17-ME-5-GREY |
| Product Type | Magazine Extension |
| Color | Gray |
| Model |
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