The Shield Arms Glock 17 magazine with +5 extension gives you a reliable 22-round 9mm capacity upgrade without sacrificing the proven reliability of OEM Glock magazines. If you're running a Glock 17 and want more rounds on tap—whether for competition, home defense, or range days—this combo delivers an extra five rounds while keeping the gun's ergonomics and handling in the familiar Glock lane. The extension is machined from billet 6061 aluminum and hard-anodized, designed to hold up under regular use.
What makes this setup stand out is the engineering behind it. Shield Arms included index cuts on the extension body to give you a more secure grip when pulling the mag from a pouch, and they designed an easy-access floor plate so you can service the spring and follower without uninstalling the extension. That's the kind of practical thinking that separates quality gear from theoretical upgrades. The included spring handles the heavier load, and the whole package is made in the USA.
Fair heads-up: this extension only works with OEM Glock 17 magazines as the base, and if you're running a Glock 19X, you'll need to remove the pistol's lanyard loop to make it fit. Most aftermarket flared mag wells play nice with it, though fit varies depending on your lower receiver. Shield Arms backs it with a lifetime warranty, so you're covered if something goes sideways.
| Product Type | Pistol Magazine with Extension |
| Brand | Shield Arms |
| Caliber | 9mm Luger |
| Base Magazine | Glock 17 OEM (17-round) |
| Total Capacity | 22 rounds |
| Extension Rounds | +5 |
| Extension Material | Billet 6061 aluminum, Type 2 anodized |
| Spring Type | Shield Arms +10% power spring |
| Firearm Compatibility | Glock 17 (OEM magazines only); Glock 19X requires lanyard loop removal |
| Country of Origin | USA |
| Warranty | Lifetime |
No. This extension is designed for OEM Glock 17 magazines only. Glock 19 mags have different dimensions and won't work with this extension.
The extension will fit, but you'll need to remove the Glock 19X's lanyard loop first for proper fitment.
You get the OEM Glock 17 magazine with the Shield Arms +5 extension pre-installed and the Shield Arms +10% power spring already in place. No additional assembly required.
This extension is compatible with most aftermarket flared mag wells, but fitment can vary depending on your specific lower receiver design. Check your mag well's specs if you're unsure.
Shield Arms
Shield Arms
