SIG SAUER Introduces the Commercial Variant of the US Military’s M18

    The New SIG P320-M18 (SIG Sauer)

    Last year SIG Sauer introduced the commercial version of their M17, the US military’s new service pistol  – the Modular Handgun System. Now SIG Sauer have announced the introduction of the P320-M18, the civilian variant of the compact M18 which is the US Marine Corps’s newly adopted sidearm.

    SIG Sauer recently celebrated successfully shipping 100,000 MHS pistols (including both M17 and M18s) to the US military.

    The New SIG P320-M18 with extended mag (SIG Sauer)

    The new pistol has a slide mounted safety and a slide cut ready for an RMR just like the military version. It also ships with a 17 round and extended 21 round magazine. Here’s SIG’s product video showing off the pistol:

    Here’s SIG Sauer’s announcement in full:

    SIG SAUER, Inc. is pleased to introduce the P320-M18, the commercial variant of the U.S. Military Modular Handgun System (MHS) M18. A smaller version of the M17, the P320-M18 features a 3.9” barrel, compact slide, and carry length grip module. The M18 was recently chosen as the official sidearm of the U.S. Marine Corps and has been recently issued alongside the full-size M17 to all branches of the US Military as a result of the MHS contract award.

    “Since the official selection of the M17 and M18 by the U.S. Army for the Modular Handgun System (MHS), we’ve seen significant civilian interest to own both variants of the handguns. The P320-based M17 and M18 are among the most tested handguns in history and the pair has been proven to be unmatched in both accuracy and reliability,” said Tom Taylor. Chief Marketing Officer, and Executive Vice President, Commercial Sales. “We are very proud that with the P320-M18, civilians can now own the same innovation and versatility that has made either the M17 and M18 the handgun of choice for all branches of the U.S. Military.”

    The P320-M18 is a 9mm striker-fired pistol with an exclusive “M18-XXXXXX” serial number that comes with one 17-round magazine and two 21-round magazines. The pistol features a SIGLITE front night sight and a removable night sight rear plate as specified by the MHS contract. The slide is optic ready and with the rear sight assembly removed, the SIG SAUER Electro-Optics ROMEO1Pro Optic mounts directly to the slide. The P320-M18 is configured nearly identically to the U.S. Military’s models and features black controls, a carry-length coyote-tan grip module, coyote PVD finished slide, and ambidextrous manual safety. The P320-M18 is also available in a state-compliant version and is currently listed on the Massachusetts handgun roster.

    The New SIG P320-M18 (SIG Sauer)

    P320-M18 Handgun Specs:

    • Overall Length: 7.2”
    • Overall Width: 1.6”
    • Weight (incl. magazine): 28.1 oz
    • Overall Height: 5.5”
    • Barrel Length: 3.9”
    • Sight Radius: 5.8”

    You can find out more about the pistol over on SIG Sauer’s website, here.

    Is the P320-M18 something you’ve been waiting for? Let us know in the comments below!

    Matthew Moss

    Matthew Moss – Assistant Editor.

    Matt is a British historian specialising in small arms development and military history. He has written for a variety of publications in both the US and UK he also runs, a blog that explores the history, development and use of firearms. Matt is also co-founder of, a new video series on historically significant small arms.

    Reach Matt at: [email protected]