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SIG Sauer P320
SIG Sauer P320
Type	Semi-automatic pistol
Place of origin	U.S.
Service history
In service	2014–present
Production history
Designer	Adrian Thomele, Thomas Metzger, Michael Mayerl, Ethan Lessard
Designed	2014
Manufacturer	SIG Sauer Inc., Exeter, NH, United States,= SIG Sauer GmbH, Eckernförde, Germany
Produced	2014-present
Variants	Full-size, Carry, Compact, and Subcompact, four calibers, three grip sizes for each, Tacops, RX and X-Five models
Specifications
Mass	833 g (29.4 oz) P320 Full Size (incl. magazine) 737 g (26.0 oz) P320 Carry (incl. magazine) 737 g (26.0 oz) P320 Compact (incl. magazine) 708 g (25.0 oz) P320 Subcompact (incl. magazine)
Length	203 mm (8.0 in) P320 Full Size 183 mm (7.2 in) P320 Carry 183 mm (7.2 in) P320 Compact 170 mm (6.7 in) P320 Subcompact
Barrel length	120 mm (4.7 in) P320 Full Size 98 mm (3.9 in) P320 Carry 98 mm (3.9 in) P320 Compact 91 mm (3.6 in) P320 Subcompact
Width	35.5 mm (1.4 in) P320 Full Size 35.5 mm (1.4 in) P320 Carry 35.5 mm (1.4 in) P320 Compact 33 mm (1.3 in) P320 Subcompact
Height	140 mm (5.5 in) P320 Full Size 140 mm (5.5 in) P320 Carry 131 mm (5.2 in) P320 Compact 119 mm (4.7 in) P320 Subcompact
Caliber	9×19mm Parabellum .357 SIG .40 S&W .45 ACP
Action	Short recoil operated, locked breech Sig Sauer System
Rate of fire	Semi-automatic
Feed system	P320 Full Size and P320 Full Size RX models: 17 rounds 9×19mm Parabellum 14 rounds .357 SIG, .40 S&W 10 rounds .45 ACP Tacops Full: 21 rounds 9×19mm Parabellum Carry: 17 rounds 9×19mm Parabellum 14 rounds .357 SIG, .40 S&W 10 rounds .45 ACP Tacops Carry: 21 rounds 9×19mm Parabellum Compact: 15 rounds 9×19mm Parabellum 13 rounds .357 SIG, .40 S&W 9 rounds .45 ACP RX Compact: 15 rounds 9×19mm Parabellum Subcompact: 12 rounds 9×19mm Parabellum 10 rounds .40 S&W 6 rounds .45 ACP
Sights	Fixed iron sights, front—blade, rear—notch, with optional tritium night inserts, Optical Reflex sight on RX models, high sights on RX and Tacops models

The SIG Sauer P320 is a modular design of semi-automatic pistol made by SIG Sauer, Inc. of Exeter, New Hampshire and SIG Sauer GmbH of Eckernförde, Germany. The SIG Sauer P320 can be chambered in 9×19mm Parabellum, .357 SIG, .40 S&W, and .45 ACP. The handguns made in 9mm, .357 SIG, and .40 S&W calibers can be easily converted from one to another. A change from .357 SIG to .40 S&W requires only a barrel change. The change between 9mm to .357 SIG or .40 S&W and vice versa are accomplished using a caliber exchange kit.

The P320 chambered in 9×19mm Parabellum was introduced in the North American market on 15 January 2014, followed by the .45 ACP compact model at the SHOT Show in January 2015.^[1] The P320 is a further development of the SIG Sauer P250, utilizing a striker-fired mechanism in lieu of a double action only hammer system. On 19 January 2017, it was announced that a customized version of the SIG Sauer P320 had won the United States Army's XM17 Modular Handgun System competition. The full-sized model will be known as the M17 and the carry-sized model will be known as the M18.^[2]

Design details

Features

SIG Sauer P320 fire control unit

The P320 was designed to be ambidextrous in handling, sporting an ambidextrous slide catch lever and user-reversible magazine catch. All other operating controls are designed so they can be operated from either side. The firearm can be field stripped with no tools. Additionally, the firearm can also be field stripped without depressing the trigger, an additional safety feature to prevent negligent discharge of the weapon.^[3]

SIG Sauer P320 Full Size

Trigger system

The P320 trigger is available in standard (solid) and tabbed (with trigger safety).^[4]

M17 and M18

When the requirements were formulated for a new handgun for the US 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 and submitted them for the XM17 Modular Handgun System competition.

Modifications include:

• Slide cut out to facilitate the addition of a reflex sight. (This is the slide from the RX Series)^[5]


• Ambidextrous thumb safety


• Loaded chamber indicator


• Improved slide sub-assembly to capture small components when disassembled


• Improved trigger "mud flap" to prevent foreign debris from entering the pistol action


• 4.7-inch (120 mm) barrel length in full size pistol


• 3.9-inch (99 mm) barrel length in compact pistol


• chambered in 9×19mm Parabellum (can be adapted to fire larger calibers like .357 SIG and .40 S&W)


• Pistols chambered in 9mm can feature a 17-round magazine as standard with optional 21-round extended magazines available.^[6]

On 19 January 2017, it was announced that the SIG Sauer P320 MHS variant had won the United States Military's Modular Handgun System trials. The P320 will be known as the M17 (full size) and M18 (compact) in U.S. Military service. Though the pistol will remain chambered in 9 x 19mm Parabellum rather than a larger caliber, the contract allows the services to procure SIG Sauer's proposed XM1152 Full Metal Jacket and XM1153 Special Purpose ammunition.^[7][8] The ammunition chosen to go with the pistol is a "Winchester jacketed hollow point" round.

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 (XM18 compact version only), and 35,000 for the Marines.^[9][10]

On 17 November 2017, soldiers of the 101st Airborne received the first XM17 and XM18 pistols, with over 2,000 handguns delivered. The XM17 has better accuracy and ergonomics and tighter dispersion than the M9. It will also be fielded more widely, being issued down to squad and fireteam leaders; while special forces would dual-arm all of its members with a pistol and rifle, previously junior leaders in regular infantry units were excluded from carrying sidearms but policy was changed to give them more choices and options in close quarters battle situations. All Army units are planned to have the M9 replaced with the M17 within a decade.^[11][12]

Drop firing problem

In late July 2017, the Dallas Police Department in Texas instructed all personnel to stop carrying the P320 pending an investigation.^[13] There are concerns that the firearm may discharge when it is dropped and the back of the slide hits the ground at a 33-degree angle. The problem may be related to the trigger weight; some triggers are heavy enough that they essentially continue to move due to inertia after the gun hits the ground. Internet publications, such as TheTruthAboutGuns.com, conducted independent tests that appear to confirm potential drop firings (at a 40% rate).^[14] Another test by omahaoutdoors.com showed similar results.^[15]

On 8 August 2017, SIG Sauer issued a notice that they would upgrade all P320s to address the issue.^[16] The P320 upgrade program is detailed on the SIG Sauer Website at: P320 Voluntary Upgrade Program.

Patent infringement lawsuit

In May 2017, Steyr Mannlicher filed a patent infringement lawsuit against SIG Sauer.^[17] Steyr references their patent US6260301 (filed in 1999 and approved in 2001), which is for a handgun with a removable chassis. Steyr Arms is demanding a preliminary and permanent injunction against SIG Sauer selling any of these firearms.

Users

• 
   Denmark: Danish Defence; SIG Sauer P320 X-Carry was chosen as the next standard issue sidearm of all the armed forces branches, replacing the ageing SIG Sauer P210 (M/49 Neuhausen).^[18] Two variants have been chosen: A regular and a concealed carry version. Deliveries should be completed by the end of 2019.^[19]


• 
   Thailand: Royal Thai Police; Purchase of 152,468 SIG Sauer P320 pistols is approved.^[20][21] The pistols were delivered in December 2017.^[22]


• 
   United States:
  
  • 
    United States Army: On 19 January 2017, the P320 was chosen to replace the Beretta M9 as its main service pistol in response to the request for a Modular Handgun System (MHS) also known as M17.^[23][24]
  
  
  • 
    Hawaii Department of Public Safety^[25]
  
  
  • 
    Chicago Police Department^[26]
  
  
  • 
    Oklahoma Highway Patrol^[27]
  
  
  • 
    Pasco County Sheriff's Office (Florida)^[28]
  
  
  • 
    Virginia State Police will be transitioning from the SIG Sauer P229R DAK in.357 SIG to the P320 in the same caliber in late 2018.^[29]
  
  
  • 
    Texas Department of Public Safety^[30]
  
  
  • 
    Largo Police Department (Florida)
  
  

References

External links

Wikimedia Commons has media related to SIG Sauer P320.

• 
  Official website P320 page


• US ARMY 101st AIRBORNE fire the M17 MHS (SIG SAUER P320) (Video)


• US ARMY 101st AIRBORNE fire the M17 MHS (SIG SAUER P320)