|Place of origin||United States|
|Used by||United States|
|Wars||War in Afghanistan|
|Manufacturer||SIG Sauer, Inc., Newington, New Hampshire, U.S.|
|Mass||M17 834 g (29.4 oz) |
M18 737 g (26.0 oz)
|Length||M17 203 mm (8.0 in)|
M18 183 mm (7.2 in)
|Barrel length||M17 120 mm (4.7 in)|
M18 98 mm (3.9 in)
|Width||35.5 mm (1.40 in)|
|Height||140 mm (5.5 in)|
|Muzzle velocity||360 m/s (1,200 ft/s)|
|Feed system||17 or 21-round box magazine|
|Sights||self-illuminating iron sights for low-light conditions|
The SIG Sauer M17 and M18 are service pistols used by the United States Armed Forces. On January 19, 2017, the United States Army announced that a customized version of the SIG Sauer P320 had won the Army's XM17 Modular Handgun System competition. The full-sized model is known as the M17, and the smaller-sized carry model is known as the M18. The guns have subsequently been adopted by the United States Army, Navy, Marine Corps, Air Force, and Space Force. It replaces the Beretta M9, as well as several other handguns across the services. There are 2 color variants, coyote brown and black, for both the M17 and M18, though the vast majority have been produced in brown.
When the requirements were formulated for a new handgun for the U.S. Army, one of the tenets of the proposal was that an existing model handgun was desired to fulfill the requirements laid out in the Modular Handgun System Request for Proposal, known as the XM17 Procurement. SIG Sauer submitted a P320 with a number of modifications for the XM17 Modular Handgun System competition.
The Modular Handgun System has self-illuminating tritium sights for low-light conditions, an integrated rail for attaching enablers and an Army standard suppressor conversion kit for attaching an acoustic/flash suppressor. Every M17/M18 handgun is test fired before leaving the factory with 13 rounds -- three to break in the weapon and ten to test accuracy.
On January 19, 2017, the United States Army announced that the SIG Sauer P320 MHS variant had won the military's Modular Handgun System trials. The modified P320 was subsequently designated the M17 (Full-Size) and M18 (Carry) for U.S. military service. The M17 has better accuracy and ergonomics and tighter dispersion than the Beretta M9 and will be fielded more widely, being issued down to squad and fireteam leaders. American special forces/special operations forces operators dual-arm all of its members with a pistol and rifle. Junior leaders in regular infantry units who were previously excluded from carrying sidearms will be given more choices and options in close quarters battle situations under a new policy. All Army units are planned to have the M9 replaced with the M17 within a decade.
In May 2017, the Army announced that the first unit that will receive the M17 would be the 101st Airborne Division by the end of the year. At the same time, the rest of the U.S. Armed Forces revealed they also intend to acquire the handgun, making it the standard sidearm for the entire U.S. military. The services plan to procure up to 421,000 weapons in total; 195,000 for the Army, 130,000 for the Air Force, 61,000 for the Navy (M18 compact version only), and 35,000 for the Marines.
The Marine Corps is replacing several handguns, while the other services had previously primarily fielded the Beretta M9 and M9A1, the Corps also planned to replace its M45A1, and M007 handguns with the M18. The M45A1 was made by Colt and the only recently fielded M007 was made by Glock.
Although it was initially announced that the U.S. Coast Guard would adopt the M17/18 handgun, the agency announced in September 2020 that they would acquire Glock 19 Gen 5 handguns through a DHS procurement. In November 2019, SIG Sauer announced the delivery of the 100,000th M17/M18 handgun to the U.S. military.
Though the pistol remained chambered in 9×19mm NATO rather than a larger caliber, the contract allowed the Army and other services to procure SIG Sauer’s proposed XM1152 Full Metal Jacket and XM1153 Special Purpose ammunition. The ammunition is a "Winchester jacketed hollow-point" round; similar in appearance to the Winchester PDX1 round but with some differences to the design of the hollow-point petals. One round is a standard 115 grain ball, designated the M1152, the other is a 147 grain Special Purpose round designated the M1153. Olin Corporation (Winchester Brand) received a contract to produce approximately 1.2 million rounds of the ammunition.
The first annual report for the XM17/XM18 Modular Handgun System (MHS) program assessment recommended the Army:
On October 11, 2018, four ceremonial M17s built by Sig Sauer's Custom Shop were presented to The Old Guard for use by the Sentinels which guard the Tomb of the Unknown Soldier at Arlington National Cemetery. Each of the four pistols bears a specific name and theme engraved on the pistols dust cover: Silence, Respect, Dignity, and Perseverance. "Silence" and "Respect," are highly polished with brown wood handgrips, used for daylight hours, while “Dignity” and “Perseverance” are matte black pistols with black wood handgrips for night duty and bouts of inclement weather. All four guns use an aluminum frame, rather than polymer plastic of the standard M17, while the controls are the standard matte black plastic. The rear slide cocking serrations of the regular M17 are replaced with "XXI," a reference to the twenty-one steps the guards take on their patrol in front of the tomb, as well as the 21-gun salute. Various materials of significance are incorporated into the pistol. The wood grips are crafted from wooden planks removed from the deck of the USS Olympia, the ship which carried the first Unknown Soldier to the United States in 1921. Marble dust from the tomb's restoration is also sealed in a glass vial is used in place of the front tritium sight. The M17s only have engravings in one area of the pistol, on the sight plate, which features an engraving of three Greek figures, Peace, Victory, and Valor.
The pistols are serialized with a unique set of serial numbers that incorporate items of significance to the Old Guard: "LS" represents line six of the Sentinels' Creed, "My standard will remain perfection"; "02JUL37" to signify the first 24-hour guard posted at the Tomb of the Unknown on July 3, 1937; "21" to signify the 21 steps it takes the Tomb Sentinels to walk by the Tomb of the Unknown, and the military honor of a 21 Gun Salute.
Tomb Sentinels carry loaded weapons, with the 21-round magazine inserted into the pistol. The magazines are customized, and features an aluminum base plate engraved with the names of the Greek figures featured on the Tomb of the Unknown – Peace, Victory, and Valor – and include a name plate on the bottom of the magazine engraved with the Tomb Sentinel badge number.
In 2018 SIG Sauer released a civilian market variant of the handgun called the P320-M17. The firearm is nearly identical, albeit lacking the tamper resistant takedown screws, and available with or without an external manual safety. The P320-M17 stainless steel slide is PVD coated and the control elements feature a black finish like found on later military M17 service pistol batches. A commemorative edition was also released, called simply the M17 Commemorative, produced in the exact specification of the original gun delivered to the army, including brown trigger and controls, the same choice of magazines selected by the military, and delivered in a plain cardboard box rather than the normal SIG Sauer hard sided black plastic case, just as military pistols were packaged. Production of the M17 Commemorative was limited to a production run of 5,000 units.
In 2020 SIG released the P320-M18, which features the same adaptation of the military configuration, this time with the shorter carry size M18.
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Sig Sauer Inc., Newington, New Hampshire, was awarded up to $580,217,000 for a firm-fixed-price contract for the Modular Handgun System including handgun, accessories and ammunition to replace the current M9 handgun. Bids were solicited via the Internet with nine received. Work locations and funding will be determined with each order, with an estimated completion date of Jan. 19, 2027. Army Contracting Command, Picatinny Arsenal, New Jersey, is the contracting activity (W15QKN-17-D-0016).