SIG M18 for Sale

Quick look at the SIG M18

The SIG M18 is the compact variant of the U.S. military's M17 Modular Handgun System, based on the P320 platform. It emphasizes modularity, durability, and consistent performance for duty and defensive use. Today, the SIG M18 is popular among military personnel, law enforcement, and civilian shooters seeking a service-proven compact sidearm.

Why the SIG M18 is a top choice

• Proven military service pistol lineage with the MHS program
• Modular fire control unit allows grip and size customization
• Factory optics-ready slide for modern red dot sights
• Excellent ergonomics with interchangeable grip modules
• Strong aftermarket support for holsters, sights, and parts

Key SIG M18 variants

Sig Sauer M18 Commemorative

Limited-run version mirroring the military-issue configuration, ideal for collectors wanting a close civilian counterpart.

Sig Sauer P320-M18

Standard commercial model with optics-ready slide and ambidextrous controls for duty and concealed carry.

Sig Sauer P320-M18 Manual Safety

Version with external manual safety, preferred by agencies and shooters who want additional control redundancy.

Sig Sauer P320 Carry M18 configuration

P320 Carry models built to similar dimensions and capacity for those prioritizing grip length and shootability.

Sig Sauer P320 Compact M18 style

Compact P320 variants in an M18-style setup, suitable for concealed carry and home defense with reduced footprint.

How the Sig M18 compares to other pistols

Best use cases for the Sig M18

• Concealed carry for those comfortable with a compact duty-sized pistol
• Law enforcement or security duty sidearm with optics capability
• Home defense handgun with high capacity and accessory support
• Practical pistol competition in production-type divisions
• Range practice and training with a military-style sidearm
• Collection piece for enthusiasts of modern U.S. service pistols

FAQs about the Sig M18

Can I mount a red dot on the SIG M18?

Most SIG M18 commercial models feature an optics-ready slide cut for compatible red dot footprints. Check the specific pistol configuration and manufacturer documentation before purchasing an optic.

What is the difference between the SIG M18 and M17?

The M18 uses a more compact slide and barrel length than the M17, while sharing the same modular fire control unit and general operating system within the P320 family.

How does the SIG M18 fit into the P320 lineup?

The SIG M18 is a compact, military-oriented configuration of the P320, offering duty-capable capacity and features in a slightly shorter package than full-size variants.