The P320-M18 California Compliant brings the same unrivaled accuracy, extreme reliability and unmatched durability demanded by the U.S. Military and chosen as the official sidearm of the U.S. Marine Corps. This commercial version is tailored for California compliance and includes SigLITE night sights with a removable rear plate for night sight attachment. The slide is optic-ready, compatible with Romeo-X, ROMEO1 PRO and ROMEO 2 red-dot optics. Finished in coyote tan, matching the military version, it comes with three 10-round magazines. Now available in California, the P320-M18 continues its legacy as a preferred choice of elite forces.

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SIG SAUER P320-M18 CA COMPLIANT 9MM 3.9” COMPACT PISTOL 10RDS, COYOTE – SLEEK AND VERSATILE – 320CA-9-M18-MS-CA

Overview

The SIG SAUER P320-M18 CA Compliant 9mm Pistol is the ultimate sidearm for discerning shooters who demand battlefield-proven performance, civilian-legal configuration, and stylish aesthetics. Engineered with precision and reliability in mind, this California-compliant compact pistol mirrors the exact specifications of the U.S. Military’s M18 sidearm, offering civilian enthusiasts the opportunity to own a piece of tactical history without compromising on state compliance.

Finished in a striking Coyote Tan PVD, the P320-M18 is a rugged and adaptable compact pistol built for duty, carry, and recreational shooting. Whether you’re a law enforcement officer, military professional, or responsibly armed civilian in California, this platform delivers accuracy, safety, and modularity like no other.

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Key Features

• California Compliant: Fully compliant with California DOJ regulations

• Caliber: 9mm Luger (9x19mm)

• Barrel Length: 3.9 inches

• Magazine Capacity: 10 rounds (2 magazines included)

• Finish: Coyote Tan PVD slide with matching grip module

• Sights: SIGLITE Front Night Sight and Removable Night Sight Rear Plate

• Action: Striker-fired

• Safety: Manual thumb safety + striker safety + disconnect safety

• Modularity: Fully modular with serialized Fire Control Unit (FCU)

• Optics-Ready: Removable rear sight plate for red dot installation

• Frame Size: Compact Carry Grip Module

• Slide Material: Stainless steel

• MSRP: Competitive pricing for duty-grade quality

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A Deeper Look: Designed for Military – Built for the Civilian Market

The P320-M18 is not just another polymer-frame striker-fired pistol — it’s a direct descendent of the M18 selected by the U.S. Armed Forces under the Modular Handgun System (MHS) program. This civilian-legal variant provides the exact performance, feel, and handling that military personnel trust, adapted for California residents with a 10-round magazine and safety features that meet state law.

The serialized Fire Control Unit (FCU) means you can completely customize the pistol to suit your needs — whether for personal defense, duty use, or competitive shooting. Want a different grip module, barrel length, or caliber? Simply swap components.

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Built for California Compliance Without Compromise

Unlike many firearms that lose their luster when adjusted for state regulations, the CA Compliant P320-M18 retains all of its robust capabilities:

• Manual Thumb Safety: Essential for CA law and adds a layer of safety many shooters prefer

• 10-Round Magazines: Ensures compliance while still offering ample capacity

• Trigger Disconnect Safety & Striker Safety: Enhances safe handling

• CA-Drop Test Certified: Passes all California safety requirements

You get a full-featured, duty-capable weapon that meets every letter of the law — without sacrificing the performance that has made the P320 platform a worldwide success.

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Performance You Can Rely On

The SIG P320-M18 CA boasts a 3.9” carbon steel barrel, striking the perfect balance between concealability and accuracy. The striker-fired trigger system delivers a smooth, crisp break with a short reset, allowing for rapid follow-up shots. Whether you’re engaging targets on the range or defending your home, this pistol gives you consistent performance every time.

The modular grip frame is designed for comfort and control, ensuring a firm hold even in high-stress situations. Additionally, the optics-ready slide allows for the addition of a red dot sight, making it future-proof for shooters who want to upgrade their setup over time.

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Construction and Materials

SIG SAUER is known for precision and durability, and the P320-M18 is no exception. The frame is made from high-strength polymer, while the stainless-steel slide has a durable Coyote PVD coating for corrosion resistance and reduced glare.

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Why Choose the SIG SAUER P320-M18 CA Compliant?

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Military-Grade Pedigree

Built to meet the standards of the U.S. Military, this platform is proven in combat and high-stress environments.

✅

California Legal

One of the few compact, optics-ready striker-fired pistols available in CA-legal configuration.

✅

Unmatched Modularity

Swap slides, barrels, grip modules, and even calibers. It’s a firearm that evolves with you.

✅

Optics Ready

Easily remove the rear sight plate and install a ROMEO1PRO or other red dot optic.

✅

Safety First

Integrated manual thumb safety, disconnect safety, and striker block meet CA requirements without sacrificing ease of use.

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Intended Users

• California Residents: Looking for a state-legal sidearm with high-end features.

• Everyday Carriers: Thanks to its compact frame and 10-round capacity.

• Tactical Shooters: Ideal for range training, defensive scenarios, and competitive shooting.

• Collectors and Military Enthusiasts: Own a piece of the U.S. military’s official sidearm lineage.

• Law Enforcement Officers: Especially those restricted by department or state regulations.

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Customization Options

The P320-M18 CA Compliant is fully compatible with SIG SAUER’s wide range of parts and accessories:

• Grip Modules: Switch sizes (small, medium, large) or colors.

• Slide Assemblies: Upgrade to longer or optics-ready variants.

• Trigger Kits: Available from SIG or aftermarket manufacturers.

• Caliber X-Change Kits: Switch to .357 SIG or .40 S&W with ease.

You can build your perfect pistol around the FCU (Fire Control Unit), the serialized heart of the P320 system.

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Real-World Reliability: Tested and Proven

The P320-M18 is field-tested, duty-approved, and user-trusted. Whether it’s law enforcement agencies, military personnel, or civilian CCW holders, countless shooters rely on the P320 platform every day.

Its sealed construction resists debris and dirt, the polymer grip offers solid control under pressure, and its night sights guarantee performance in low light.

Thousands of rounds of testing and daily service use mean you can trust this pistol in life-or-death situations or weekend range sessions alike.

SIG SAUER P320-M18

SIG SAUER P320-M18

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FAQs – SIG P320-M18 CA Compliant

Q: Is this pistol on the California handgun roster?

A: Yes, it meets California DOJ standards and is listed for sale in the state.

Q: Can I use aftermarket red dot sights?

A: Absolutely. The removable rear sight plate allows easy mounting of optics like the SIG ROMEO1PRO, Holosun, and others.

Q: Are other magazine capacities available?

A: This version comes with 10-round mags to comply with CA law. Higher-capacity magazines are not legal for CA civilian use.

Q: Does it accept standard P320 parts?

A: Yes. It’s fully modular and compatible with all P320 components and caliber exchange kits.

SIG SAUER P320-M18

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Final Verdict: Should You Buy the SIG P320-M18 CA Compliant?

If you’re in California and want a reliable, military-grade sidearm that doesn’t cut corners, the SIG SAUER P320-M18 CA Compliant is one of your best options. You’re not just buying a gun—you’re investing in the same performance, reliability, and modularity trusted by U.S. Armed Forces.

SIG SAUER P320-M18

SIG SAUER P320-M18

Whether you’re upgrading from another compact, adding to your collection, or purchasing your first high-quality handgun, this is a standout choice. p320 m18 price

Ready to step up your sidearm game? Choose the SIG P320-M18 CA Compliant today.

• SIG SAUER P320-M18 CA Compliant 9mm pistol

• Compact California compliant handgun

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• SIG P320-M18 320CA-9-M18-MS-CA specs

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  SIG SAUER P320-M18

  SIG SAUER P320-M18