SIG Sauer P320

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SIG Sauer P320
Sig Sauer P320 Modular Handgun System.jpg
SIG Sauer P320
TypeSemi-automatic pistol
Place of originUnited States
Service history
In service2014–present
Production history
DesignerAdrian Thomele, Thomas Metzger, Michael Mayerl, Ethan Lessard
Designed2014
ManufacturerSIG Sauer Inc., Exeter, New Hampshire, U.S.; SIG Sauer GmbH, Eckernförde, Germany
Produced2014–present
VariantsFull-size, Carry, Compact, and Subcompact, four calibers, three grip sizes for each, Tacops, RX and X-Five models
Specifications
Mass833 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)
Length203 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 length120 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
Width35.5 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
Height140 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

Caliber9×19mm Parabellum
.357 SIG
.40 S&W
.45 ACP
ActionShort recoil operated, locked breech Sig Sauer System
Rate of fireSemi-automatic
Muzzle velocity1198 ft/s (365 m/s)[1]
Feed systemP320 Full Size and P320 Full Size RX models:

Tacops Full:

Carry:

Tacops Carry:

Compact:

RX Compact:

Subcompact:

SightsFixed 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 semi-automatic pistol made by SIG Sauer, Inc. of Exeter, New Hampshire, and SIG Sauer GmbH of Eckernförde, Germany. It is a further development of the SIG Sauer P250, utilizing a striker-fired mechanism in lieu of a double action only hammer system. The P320 can be chambered in 9×19mm Parabellum, .357 SIG, .40 S&W and .45 ACP, and can be easily converted from one caliber to another—a change from .357 SIG to .40 S&W requires only a barrel change; a 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.[2] 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.[3]

Design details[edit]

Features[edit]

SIG Sauer P320 fire control unit

The P320 was designed to be ambidextrous in handling, sporting a catch lever on both sides of the slide and user-reversible magazine release, and 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.[4]

SIG Sauer P320 Full Size

Trigger system[edit]

The P320 trigger is available in standard (solid) and tabbed (with trigger safety).[5]

M17 and M18[edit]

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)[6]
  • 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.[7]

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.[8][9] 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.[10][11]

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.[12][13]

Reliability[edit]

Initial production models of the P320 were noted to have a 'drop safety' issue if the firearm was dropped on a specific angle causing it to discharge. Sig has since refitted the P320 with a new trigger with reduced mass and a new striker disconnect that makes it drop safe. Sig also offers a voluntary exchange program to fix any defective P320's.

Apart from initial teething issues, the P320 has proven itself to be an extremely reliable pistol for civilian, law enforcement and military use. Many police departments in the US and around the world have started issuing their officers P320's.[14][15][16][17]

X Series Models[edit]

Introducing January 17, 2019, SIG Sauer published that they are releasing the XCompact handgun as the newest part of their X Series lineup.[18] Their current X-Series lineup includes the following grip module sizes:

  • Full Size - Fits any SIG P320 full size slide in 9mm, .40 S&W, and .357 SIG
  • Carry Size - Fits any SIG P320 compact size slide in 9mm, .40 S&W, and .357 SIG. The full size slide also fits the carry size grip module without any part of the recoil spring showing.
  • Compact Size - Fits any SIG P320 subcompact size slide in 9mm, .40 S&W, and .357 SIG. The compact size slide also fits the subcompact size grip module without any part of the recoil spring showing. The full size slide will not fit properly on the XCompact size grip module

The XCompact size grip module is the smallest grip module SIG currently carries, as they have not come out with a subcompact X Series grip module to date.

XFive Legion[edit]

Release in late July/early August of 2019 the XFIVE Legion is considered the flagship of the P320 platform that brings a balance of added weight and features. The TXG grip module has tungsten infused directly into the polymer along with an attachable magazine well. It comes standard with Henning group aluminum base pads and a skeletonized flat trigger. The complete 9mm slide is cut and ported to reduce weight and assist in recoil and feeding abilities. It also has a slide plate for optic capabilities.[19]

Drop firing problem[edit]

In late July 2017, the Dallas Police Department in Texas instructed all personnel to stop carrying the P320 pending an investigation.[20] 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).[21] Another test by omahaoutdoors.com showed similar results.[22][dubious ]

On 8 August 2017, SIG Sauer issued a notice that they would upgrade all P320s to address the issue.[23] The P320 upgrade program is detailed on the SIG Sauer Website at: P320 Voluntary Upgrade Program.

Patent infringement lawsuit[edit]

In May 2017, Steyr Mannlicher filed a patent infringement lawsuit against SIG Sauer.[24] Steyr references their patent US6260301 (filed in 1999 and approved in 2001),[25] 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[edit]

References[edit]

  1. ^ https://www.sigsauer.com/press-releases/sig-sauer-introduces-m17-9mm-p-ammunition/
  2. ^ "SHOT Show 2015: SIG SAUER adds subcompact and .45-Caliber options to P320 family". miltechmag.com. Retrieved 28 February 2017.
  3. ^ OMelveny, Sean. "Army Picks Sig Sauer's P320 Handgun to Replace M9 Service Pistol". military.com. Retrieved 28 February 2017.
  4. ^ "P320 Pistol - Officer.com". officer.com. Retrieved 28 February 2017.
  5. ^ "Review: SIG Sauer P320 Pistol". shootingillustrated.com. Retrieved 11 March 2017.
  6. ^ "Details on the U.S. Army's new Sig Sauer M17 Sidearm". tacticalcache.com. Retrieved 11 March 2017.
  7. ^ Times, Military. "GearScout". militarytimes.com. Retrieved 28 February 2017.
  8. ^ "Contracts Press Operations Release No: CR-012-17 Jan. 19, 2017". defense.gov. defense.gov. Retrieved 13 February 2017. 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).
  9. ^ Army Confirms 9mm for Modular Handgun System - Kitup.Military.com, 26 January 2017
  10. ^ Army Names First Unit to Receive Service's New Pistol - Military.com, 3 May 2017
  11. ^ MHS Update: Services Embrace Army’s New Sidearm - Kitup.Military.com, 3 May 2017
  12. ^ In a first, the Army’s new handgun will be issued to team leaders - Armytimes.com, 29 November 2017
  13. ^ Army Explains New Dual-Arming Policy for Modular Handgun System - Military.com, 1 December 2017
  14. ^ https://www.guns.com/news/2019/07/22/milwaukee-police-chose-sig-sauer-p320-as-new-duty-pistol
  15. ^ https://www.policemag.com/527034/newington-nh-police-department-transitions-to-sig-sauer-p320-pistol
  16. ^ http://directives.chicagopolice.org/directives/data/a7a57b38-137ec5db-e6913-7ec6-7ee3ce8cb24a817d.html
  17. ^ https://www.ammoland.com/2019/05/lloyd-harbor-ny-police-department-transitions-to-sig-sauer-p320/#axzz62rUjd4Hu
  18. ^ "Sig XCompact - Small Gun Parts" (PDF).
  19. ^ "Sig P320 X-FIVE Legion - Small Gun Parts". Small Gun Parts.
  20. ^ "BREAKING: P320 Recall Issued By Dallas Police - Prohibited From Duty Till Repaired - The Firearm Blog". 2 August 2017.
  21. ^ "BREAKING: TTAG Test Shows P320 Striker-Fired Pistols Are Not Drop-Safe - The Truth About Guns". 8 August 2017.
  22. ^ "Sig Sauer P320 Fails Drop Test". 7 August 2017.
  23. ^ "SIG SAUER Issues Voluntary Upgrade of P320 Pistol - Sig Sauer".
  24. ^ "Steyr Files Lawsuit Against SIG SAUER, Demands Injunction Against P320 for Patent Infringement - The Truth About Guns". 5 May 2017.
  25. ^ "Pistol, whose housing is composed of plastic". Retrieved 11 July 2019 – via Google Patents.
  26. ^ "Forsvarets nye pistol: Sig Sauer". forsvaret.dk. 12 April 2018.
  27. ^ "Den nye pistol er valgt". fmi.dk. 12 April 2018.
  28. ^ "Norwegian Police Adopt SIG SAUER P320 X-Series as Service Pistol". 8 November 2018.
  29. ^ "Police chief to seek approval from ministry to make direct order of 150,000 Sig Sauer pistols". Thai PBS. 21 August 2015. Retrieved 21 August 2015.
  30. ^ "Gen Prayut Chan-o-cha Approves Royal Thai Police's Purchase of 152,468 SIG Sauer Model P320 Pistols". Chiang Rai Times.com. Retrieved 28 February 2017.
  31. ^ "Claims of gangsters buying police pistols are false, says RTP spokesman". The Nation. 24 December 2017. Retrieved 24 December 2017.
  32. ^ "US Department of Defense Contracts". 19 January 2017. 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).
  33. ^ "Army".
  34. ^ "US Air Force Begins Issuing M18 Pistol -". The Firearm Blog. 8 March 2019. Retrieved 17 June 2019.
  35. ^ "It is official: ICE tells employees the Sig 320 is their new gun". NEWSREP. 24 February 2017. Retrieved 11 June 2019.
  36. ^ "Hawaii DPS". Thefirearmsblog.com.
  37. ^ "CPD U04-02-01" (PDF).
  38. ^ "Oklahoma Highway Patrol Selects SIG SAUER P320". SIG Sauer. 22 June 2015. Archived from the original on 5 September 2015.CS1 maint: BOT: original-url status unknown (link)
  39. ^ "Pasco sheriff's deputies trade in Glocks for free SIG Sauer service handguns". Tamba Bay Times. 20 May 2016. Retrieved 6 August 2016.
  40. ^ "Virginia State Police select SIG Sauer P320 Pistol for standard issue firearm".
  41. ^ "Texas Department of Public Safety Selects SIG SAUER P320 | Sig Sauer". Sig Sauer. Retrieved 23 June 2018.

External links[edit]