Warne MESIG54GR 6061-T6 Aluminum Magazine Extension for Sig P320 - Hardcoat Anodized Gray, Adds 5 Rounds (9mm Luger)

A Warne MESIG54GR magazine extension for Sig P320 gives your 9mm carry gun or duty pistol five extra rounds per magazine—without reshaping your grip or compromising your setup. Built from 6061-T6 aluminum and finished in hardcoat anodized gray, this extension bolts straight onto your existing Sig P320 magazine, adding capacity where it counts. Whether you're running the gun for self-defense, competitive shooting, or training, the ability to load five more rounds means fewer reloads downrange and faster time between mag changes.

The hardcoat anodized finish is built to take a beating. Unlike standard anodizing, hardcoat creates a thicker, denser oxide layer that resists wear, corrosion, and cosmetic damage—important for a part that rides in and out of your magazine pouch hundreds of times. The gray tone matches most modern P320 setups and won't show dust or wear as easily as black.

Installation is straightforward: remove your magazine, stack the extension onto the base, and lock it down. The fit is tight and reliable, with no wobble or rattle once seated. For shooters building out a P320 for duty, home defense, or the range, this extension pays dividends in firepower and reload speed without forcing you to buy new magazines or train with unfamiliar ergonomics.

Key Features

• Adds 5 rounds to standard Sig P320 9mm magazines
• 6061-T6 aluminum construction—light and tough
• Hardcoat anodized gray finish resists corrosion and wear
• Direct fit for Sig P320 magazines; no modification needed
• Compact, low-profile design maintains normal carry feel

Specifications

Frequently Asked Questions

Will this magazine extension fit my Sig P320 magazines?

Yes. The Warne MESIG54GR is designed to stack directly onto standard Sig P320 9mm Luger magazines. No fitting or modification required.

Does the extension change how the magazine feels in my hand or gun?

The extension adds height and capacity but maintains a low-profile design. Your grip angle and contact points stay essentially the same, so the gun feels familiar even with the added five rounds.

How durable is the hardcoat anodized finish?

Hardcoat anodizing is a thickened, denser oxide layer than standard anodizing. It's engineered to handle repeated insertion and removal from magazine pouches, resist corrosion, and maintain its appearance longer than conventional finishes.

How do I install the extension?

Unload and remove your magazine, align the extension onto the magazine base, and secure it according to the manufacturer's instructions. No gunsmithing required.