Agency Mag Ext Sig P320 17Rd +5 Blk

The Agency Arms magazine extension for the Sig Sauer P320 gives you a genuine capacity boost when you need it. This 17-round base pad extension adds 5 rounds of carry capacity, transforming your standard P320 magazine into a higher-capacity alternative without requiring a different gun or mag system. Built in black, it's designed for shooters who want more ammunition on board—whether you're running training drills, competing, or simply prefer a deeper magazine well for grip and control.

Agency Arms focuses on purpose-built upgrades for serious shooters. This extension is straightforward: it fits the Sig P320 platform and extends your existing magazine tubes. It's the kind of upgrade that appeals to folks who've already invested in their P320 and want to extract more capability from their setup without starting over.

Like any magazine extension, proper function depends on clean installation and quality ammunition. If you're new to mag extensions, take a moment to seat it correctly and test-fire to confirm reliability with your carry or duty ammo. Agency Arms products are engineered for the working shooter, and this extension follows that ethos.

Key Features

• Increases standard P320 magazine capacity by 5 rounds (17 rounds total)
• Black finish
• Designed specifically for Sig Sauer P320 platform
• Straightforward installation on existing P320 magazines

Frequently Asked Questions

Will this work with my Sig P320?

Yes—this extension is designed for the Sig Sauer P320 platform. It fits standard P320 magazines and extends them to 17 rounds.

What's included with the magazine extension?

You receive the base pad extension itself. It installs onto your existing P320 magazine tube.

What's the total capacity after the extension is installed?

The extension adds 5 rounds to your magazine, bringing the total to 17 rounds.