SIG Sauer M17

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 P320 is known as the M17 (Full-Size) and M18 (Carry) in U.S. military service. Though the pistol will remain chambered in 9 x 19mm NATO rather than a larger caliber, the contract allows the Army and other services to procure SIG Sauer’s proposed XM1152 Full Metal Jacket and XM1153 Special Purpose ammunition.[9][10] The ammunition chosen to go with the pistol is a "Winchester jacketed hollow point" round; similar in appearance to the Winchester PDX1 round but with some differences to the design of the hollowpoint petals. The M17 has better accuracy and ergonomics and tighter dispersion than the M9 and will be fielded more widely, being issued down to squad and fireteam leaders. Special forces 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.[11][12]

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.[13][14]

The U.S. Marine Corps is replacing its M9, M9A1, M45A1, and M007 handguns with the SIG Sauer M18 handguns. The M9 and M9A1 were produced by Beretta while the M45A1 was made by Colt and the M007, which was only recently accepted as a variant, is made by Glock.[15]

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 handguns through a DHS procurement.[16] In November 2019, SIG Sauer announced the delivery of the 100,000th M17/M18 handgun to the U.S. military.[17]

As part of the MHS procurement, a new source for ammunition was solicited. The two types to be procured are the 9×19mm Parabellum, 115 grain XM1152 Ball and 147 grain XM1153 Special Purpose, now the M1152 and M1153. Olin Corporation (Winchester Brand) has received that award for approximately 1.2 million rounds of ammunition. The ammunition mentioned here In the infobox is Winchester Civilian issue.[18]

• Bismarck Police Department: Adopted the P320 after also testing the Smith & Wesson M&P M2.0, and the Glock 17 and 19. The BPD's police chief, Dan Donlin, said that the "SIG Sauer, in the majority of opinions, outperformed the Glock" and that it "provided a lot more overall comfort and handling in the varying hand sizes of our officers," referring to the P320's three grip module sizes. He further added that the "SIG [Sauer P320], out of the box, was very accurate. Even our best shooters couldn't believe how much better they shot with the SIG versus the Glock."[25]
• North Dakota Highway Patrol[26]
• Santa Barbara County Sheriff's Office[26]
• High Point Police Department[26]
• Oklahoma Highway Patrol[26]
• Hawaii Department of Public Safety[26]
• Pasco County Sheriff’s Department (Florida)[26]
• Elkhart Police Department (Indiana)[26]
• Milwaukee Police Department
• Texas Department of Public Safety
• Ohio State Highway Patrol

Canadian Special Forces (JTF2) were issued them. (Currently on hold)[27]

Although the P320 is not exactly the same as the M17/M18, they are closely related, and will be sourced from a U.S. factory in Newington, New Hampshire, and a German site at Eckernförde, Germany.