M17/M18

The standard US military sidearm since 2017 — a modular, striker-fired 9mm pistol built by SIG Sauer to replace the Beretta M9, and the subject of an unresolved safety controversy that led to an Air Force use-pause in 2025.

Overview

The M17 (full-size) and M18 (compact) are the US Department of Defense’s standard-issue service pistols, adopted under the Modular Handgun System (MHS) contract awarded to SIG Sauer in January 2017. Both are military-configured variants of the company’s P320 striker-fired platform, chambered in 9×19mm NATO and designed around a removable, serialized fire-control unit that permits caliber, grip, and size changes without tools. The pistols replaced the Beretta M9 across all US military services, with total procurement approaching 421,000 units and unit costs implied at roughly $1,378 per weapon within a bundled $580 million programme, according to Guns.com and SIG Sauer.

Development

The MHS programme sought a modern, modular sidearm to replace the aging M9. After a competitive evaluation that included pistols from Glock, FN, and Beretta, SIG Sauer’s P320 was selected in January 2017 and the first batches were fielded later that year. The Army took the M17 full-size; the M18 compact was procured for the Marine Corps, Navy, and Air Force. Production ramped quickly: the 100,000th pistol was delivered in November 2019, and over 165,000 M18s alone were eventually inventoryed. The programme represented the largest US small-arms transition since the M16 and marked a wholesale shift to striker-fired, polymer-frame handguns, a path already widely trodden in the commercial and law-enforcement markets, as documented by Wikipedia.

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