New Report & Testing Confirms SIG Sauer’s Modular Handgun System is Reliable

    SIG Sauer M18

    SIG Sauer's MHS Compact pistol, the M18 (SIG Sauer

    The US Army selected SIG Sauer’s Modular Handgun System entry back in 2017 and since then the full-size sidearm has begun to reach active units. Some controversy regarding reliability initially surrounded the XM17 but a recent report from the Director of Operational Testing and Evaluation confirms these issues have now been addressed.

    The recently published annual report from the Director of Operational Testing and Evaluation (DOT&E) Annual Report confirms the M17 and M18’s reliability performance. The report notes that “the MHS experienced a large number of stoppages in early developmental testing with ball ammunition”, however, it seems this issue has now been addressed by a team of both government and SIG Sauer personnel. To ensure reliable feeding with both the Army’s new 147 grain XM1153 jacketed hollow point round and 115 grain XM1152 ball ammunition a number of changes were made to the magazine spring, magazine follower, slide geometry, and some of the pistol’s internal components. The report concludes that “the XM17 and the XM18 are operationally effective and operationally suitable with jacketed hollow point ammunition.

    Examining the data provided in the DOT&E report it appears that both pistols have improved function with both types of ammunition but that the XM18 is now superior to the XM17 in terms of reliability with the compact pistol improving more between the first and second product verification tests (PVT). The XM17’s reliability with XM1152 Ball has improved significantly, but its round count before a failure decreased from 7,009 to 6,349. With XM1153 JHP rounds the XM17’s reliability has decreased with the mean number of rounds before a stoppage decreasing from 2,709 to 1,880. Similarly, the mean round count before failure with the JHP round has fallen from 15,501 to 10,321. It should be noted, however, that while performance with JHP has decreased it is still superior to XM1152 Ball and reliability with both ammunition types falls well within the army’s reliability requirements of firing 5,000 rounds before a failure.

    The striker-fired XM17 and XM18 pistols can be outfitted with suppressors and accommodate standard and extended-capacity magazines.

    An earlier photograph of the XM18 and XM17  (US Army)

    SIG Sauer celebrated the DOT&E report and the positive results of recent Lot Acceptance Testing with a press release. During a round of acceptance testing, 12,000 rounds were put through three M18s without a single stoppage. SIG Sauer confirmed that in addition to the endurance test the M18 also “passed a parts interchange test, met all of the stringent accuracy and dispersion requirements, was tested for firing pin indent and trigger pull measurements to ensure consistency, and conformed to all workmanship standards.

    Ron Cohen, President & CEO of SIG Sauer, said:

    the results of this testing for the M18 pistol is truly impressive. The M18 withstood the harsh testing and performance requirements set forth in the MHS contract and has set a new standard for reliability in service pistols. For this testing the U.S. Army set very high standards for quality and performance, and at SIG we relish the opportunity to meet a challenge and exceed expectations. The performance of the M18 not only surpassed the U.S. Army’s testing requirements, its performance was simply outstanding and nothing short of perfection.

    In their statement, SIG Sauer also confirmed that of the 480,000 pistols ordered, the first 20,000 have now been delivered. The US Army (including Army Special Operations Command) intends to purchase 233,429 pistols, 4.5% or 10,500 of which will be M18s. Under the same contract the Navy, USMC and Air Force can purchase as many as 224,000 pistols – it is unknown what the M17/M18 ratio from branch to branch will be. We haven’t yet seen DoD photographs of the M18 in service personnel’s hands and it’s interesting to note that the pistol posted with SIG Sauer’s statement (featured above) has black rather than coyote-tan controls.

    General Officer MHS confirmed? (SIG Sauer)

    One final snippet we might have learned from SIG Sauer’s new M18 photo is from the operator manual behind the pistol itself, it lists the NATO Stock Number (NSN) of a ‘GO’ or General Officer’s pistol. So we can guess that there’s a General Officer’s MHS pistol, we just don’t know what it looks like yet.

    Sources: 1 2

    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]