SIG M400
The SIGM400 is a family of firearms manufactured by SIG Sauer. The M400 is an air-cooled, direct impingement gas-operated, magazine-fed carbine based on the earlier AR-15 rifle. It is chambered for either 5.56×45mm NATO or.300 AAC Blackout cartridges, and can have a fixed or telescoping stock.
Also recorded as M400 · SIGM400
SIG M400
Sig Sauer company · CC0
- Name
- SIG Sauer SIGM400 series
- Field
- semi-automatic rifle · carbine
- Region
- United States
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wikidata · Q15991101
In this article
Key facts
Key facts
• Name — SIG Sauer SIGM400 series • Origin — United States • Type — Semi-automatic rifle Carbine • Is Ranged — yes • Service — 2011–present • Used By — See users • Wars — War in Iraq (2013–2017) Islamic State insurgency in Iraq (2017–present) Operation Containment • Design Date — 2000s • Manufacturer — SIG Sauer • Production Date — 2011–present • Weight — 7.6 lb • Part Length — 11.5 – (5.56×45mm) 9 – (.300 AAC) • Cartridge — 5.56×45mm NATO.300 AAC Blackout • Action — Direct gas impingement system, rotating bolt • Feed — STANAG magazines
Operating mechanism
Operating mechanism
The SIGM400 is a semi-automatic firearm firing from a closed bolt and uses a direct impingement gas system.
Features
Features
The M400 is offered as either a rifle or as a pistol and is intended for law enforcement, military and civilian markets. Rifles are chambered in either 5.56×45mm NATO with 14.5 in, 16 in, 18 in, or 20 in threaded barrels, or.300 AAC Blackout with 9 in or 16 in threaded barrels. There are California compliant ("featureless") models for both. The.300 AAC Blackout model is tailored specifically for efficient use with suppressors, which SIG Sauer also manufactures. The SIGPM400 Elite PSB pistol is chambered for 5.56×45mm NATO with an 11.5 in barrel and is chambered for.300 AAC Blackout with a 9 in barrel. Both use a Pistol Stabilizing Brace accessory.
Variants
Variants
Variants include rifles like the M400 Classic, SRP, Tread, Elite, or Predator, and the Elite PSB pistol.
M400 PRO
M400 PRO
The M400 PRO is an improved version of the SIG M400 chambered in 5.56×45mm NATO. Changes include a cold-hammer forged barrel, 2-stage match trigger, free-floated M-LOK handguard, folding front sight, and an updated 6-position collapsible stock.
M400 Tread
M400 Tread
The M400 TREAD is a budget-oriented variant of the M400 named for the Gadsden flag and its slogan "Dont Tread On Me". Chambered in 5.56×45mm NATO, it features a 16-inch hammer-forged barrel with a 1:8 twist and proprietary Taper-Lok muzzle threading, mid-length low-profile gas system, 15-inch free-floated handguard, and a Magpul SL-K adjustable stock. The pistol grip can hold AA, CR123A, or CR2032 batteries. Iron sights are not included.
Users
Users
•: M400 PRO used by Civil Police of Rio de Janeiro State. •: Iraqi Special Operations Forces •: Omani Military •: M400 PRO used by Philippine Army as a replacement for the M16A1. * • Detroit Police Department SWAT • Florida Highway Patrol • Franklin County, Ohio Sheriff's Office • Philadelphia Police Department: M400 PRO. • Vermont State Police
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Places
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- United States
Named but not plotted · 1
SIG M400 is associated with United States.
Country
Text attribution
Licensing
Text attribution
Part of the biographical narrative on this page reuses licensed material. Its origin, revision and licence are recorded here.
The biographical narrative on this page is based on the Wikipedia article SIG Sauer SIGM400, revision 1369305448 (EN edition), by its contributors. VALÉORINE has edited that text and built its own documentary record around it. The reused material is available under CC BY-SA 4.0, and this page's reuse of it is offered under the same licence. Everything else on this page — the chronology, the holdings, the evidence, the plates and the connections — is VALÉORINE's own record. Sources and licences.
References
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Connections
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Broader subject
1- semi-automatic rifleTerminology
Established from a fact already recorded on a verified source.
The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 14 August 2026.
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