Sig Sauer P320-M18 Carry 9mm Pistol Stainless Steel - 10 Round Capacity

The Sig Sauer P320-M18 Carry is a purpose-built 9mm pistol engineered for shooters who demand a reliable, compact sidearm that doesn't compromise on capability. Built on Sig's modular P320 platform, the M18 bridges the gap between concealed carry and duty performance—offering the same proven action trusted by military and law enforcement, packaged in a carry-friendly footprint. With a 3.9-inch barrel, 7.2-inch overall length, and stainless steel construction finished in Coyote PVD, this is a gun that handles equally well in a holster or on the nightstand.

What sets the M18 apart is its versatility. The optic-ready slide accepts both Romeo1PRO and Deltapoint PRO reflex sights for those who run a mounted optic, while the removable night sight plate lets you choose your setup. The coyote grip module is sized for the carry profile, and the ambidextrous manual safety means left and right-handers operate it the same way. The striker-fired trigger delivers a short, tactile reset—familiar to anyone who's shot a modern polymer pistol, quick to reset for follow-up shots.

This particular M18 comes configured for states with magazine capacity restrictions, shipping with three 10-round steel magazines. That 10-round limit keeps it compliant in places like Massachusetts while maintaining the same ergonomics and point-of-aim as the full-capacity variants. It's a legitimate solution for carry in restrictive jurisdictions—not a compromise gun, just a P320 M18 that obeys local law. The gun weighs 28.1 ounces loaded, sits 5.5 inches tall, and presents a clean 5.8-inch sight radius for accurate shooting from the draw.

Sig's reputation for durability is built into every P320. This stainless steel slide and frame combination resists corrosion in field conditions, and the proven P320 action has logged countless rounds downrange. Whether your carry mission is daily concealment, truck gun, or primary backup, the M18 gives you a serious 9mm in a package that works.

Key Features

• Optic-ready slide with removable night sight plate; compatible with Romeo1PRO and Deltapoint PRO optics
• Coyote PVD finish on stainless steel slide resists corrosion and wear
• Ambidextrous manual safety—operates the same from either side
• Striker-fired action with short, tactile trigger reset for rapid follow-ups
• Modular P320 platform allows grip, slide, and fire control unit customization
• SigLite front sight and night sight rear plate for low-light awareness
• Compact carry length barrel (3.9 in) and compact grip module for concealability
• Includes three 10-round steel magazines (state-compliant configuration)
• Stainless steel frame and slide for corrosion resistance

Specifications

Frequently Asked Questions

Will this P320-M18 accept higher-capacity magazines, or is it locked to 10 rounds?

The P320-M18 uses the standard P320 magazine well. This particular configuration ships with three 10-round magazines for legal compliance in restricted states. The P320 platform accepts various magazine capacities; you should verify your local laws before using magazines of different capacities.

Can I mount a red dot sight on the M18 slide?

Yes. The slide is optic-ready and compatible with Romeo1PRO and Deltapoint PRO reflex sights. The removable night sight rear plate allows you to set up the gun the way you want it.

Is the ambidextrous safety really useful for lefties, or is it just marketing?

The ambidextrous manual safety operates fully from either side—no compromises. Left-handers get the same positive engagement and ease of manipulation as right-handers, making the M18 equally practical for both.

What's included in the box?

The M18 ships with three 10-round steel magazines and the pistol itself. It does not include higher-capacity magazines; any additional magazines would need to be purchased separately and must comply with your local laws.