The SIGM400 is a family of firearms manufactured by SIG Sauer. The M400 is an air-cooled,

direct impingement Direct impingement is a type of gas operation for a firearm that directs gas from a fired cartridge indirectly (through the barrel, through a gas block, and then through a gas tube) into the bolt carrier or slide assembly to cycle the action. F ...

gas-operated, magazine-fed

carbine A carbine ( or ) is a long gun that has a barrel shortened from its original length. Most modern carbines are rifles that are compact versions of a longer rifle or are rifles chambered for less powerful cartridges. The smaller size and lighte ...

that is based on the earlier

AR-15 An AR-15-style rifle is any lightweight semi-automatic rifle based on the Colt AR-15 design. The original ArmaLite AR-15 is a scaled-down derivative of Eugene Stoner's ArmaLite AR-10 design. The then Fairchild Engine and Airplane Corporatio ...

rifle. Depending on the variant, it can be chambered for

5.56×45mm NATO The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO, but often pronounced "five-five-six") is a rimless bottlenecked intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. It consists of the SS109, L110, an ...

.300 AAC Blackout The .300 AAC Blackout (designated as the 300 BLK by the SAAMI and 300 AAC Blackout by the C.I.P. or 300 AAC Blackout'' C.I.P. TDCC sheet 300 ACC Blackout/ref>), also known as 7.62×35mm, is an intermediate cartridge developed in the United Sta ...

cartridges, and may have a fixed or

telescoping stock A gunstock or often simply stock, the back portion of which is also known as a shoulder stock, a buttstock or simply a butt, is a part of a long gun that provides structural support, to which the barrel, action, and firing mechanism are attached. ...

Design details

Operating mechanism

The SIGM400 is a semi-automatic firearm in either rifle as the SIGM400 Classic, SRP, Tread, Elite, Predator or pistol as the Elite PSB, intended for law enforcement, military and civilian markets. It fires from a

closed bolt A semi or full-automatic firearm which is said to fire from a closed bolt is one where, when ready to fire, a round is in the chamber and the bolt and working parts are forward. When the trigger is pulled, the firing pin or striker fires th ...

and uses a

gas system.

Features

The SIGM400 Predator is a rifle while the SIGPM400 Elite PSB is a pistol. The rifles are chambered for either

with , , , or barrels threaded 1/2x28, or chambered for

with or barrels which are threaded 5/8x24 for muzzle devices such as

sound suppressor A silencer, also known as a sound suppressor, suppressor, or sound moderator, is a muzzle device that reduces the acoustic intensity of the muzzle report (sound of a gunshot) and muzzle rise when a gun (firearm or air gun) is discharged, b ...

s. There are California compliant (" featureless") models for both. The .300 AAC Blackout model is tailored specifically for efficient use with suppressors. The

Picatinny rail The Picatinny rail ( or ), or Pic rail for short, also known as a MIL-STD-1913 rail, 1913 rail or STANAG 2324 rail (cancelled), is a military standard rail interface system that provides a mounting platform for firearm accessories. It was ...

supports optical, electro optical, or iron sights. SIG Sauer also manufactures suitable suppressors. The SIGPM400 Elite PSB pistol is chambered for 5.56×45mm NATO with an barrel and is chambered for .300 AAC Blackout with a barrel. Both use a Pistol Stabilizing Brace accessory.

Users

* : Egyptian Special Forces Sa'ka , Navy Sa'ka And paratroopers * :

Iraqi Special Operations Forces The Iraqi Special Operations Forces (ISOF) ( ar, قوات العمليات الخاصة العراقية) are a special operations force of Iraq. The unit was created in 1950, but was disbanded and recruited from scratch by coalition forces after ...

use the SIG Sauer M400. * : Oman Military use the SIG Sauer M400. * :

US Military The United States Armed Forces are the Military, military forces of the United States. The armed forces consists of six Military branch, service branches: the United States Army, Army, United States Marine Corps, Marine Corps, United States N ...

Philadelphia Police Department The Philadelphia Police Department (PPD or Philly PD) is the police agency responsible for law enforcement and investigations within the City of Philadelphia, Pennsylvania. The PPD is one of the oldest municipal police agencies, fourth largest ...

, Detroit Police Department SWAT, Franklin County, Ohio Police Department,

California Highway Patrol The California Highway Patrol (CHP) is a state law enforcement agency of the U.S. state of California. The CHP has primary patrol jurisdiction over all California highways and roads and streets outside city limits, and can exercise law enforcem ...

Indiana State Police The Indiana State Police is the statewide law enforcement agency for the U.S. state of Indiana. Indiana was the 12th state to offer protection to its citizens with a state police force. Its headquarters are in the Indiana Government Center Nor ...

Vermont State Police The Vermont State Police (VSP) is the state police agency for the US state of Vermont. The force has jurisdiction throughout the entire state. The Vermont Public Safety Commission directs policy and selects the commander. The commander is Colone ...

Virginia State Police The Virginia State Police, officially the Virginia Department of State Police, conceived in 1919 and established in 1932, is the state police force for the U.S. state of Virginia. The agency originated out of the Virginia Department of Motor Vehi ...

use the SIG Sauer M400.

References

{{SIG Sauer Rifles .300 BLK firearms 5.56×45mm NATO firearms Assault rifles of Switzerland Semi-automatic rifles SIG Sauer rifles AR-15 style rifles Weapons and ammunition introduced in 2010

Design details

Operating mechanism

Features

Users

See also

References