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SIG Sauer Introduces M400 Carbine

September 30, 2011  | 

Photo: SIG Sauer.
Photo: SIG Sauer.
SIG Sauer has introduced the SIG M400 tactical carbine, an improved version of its 5.56x45mm military issue tactical carbine.

The SIG M400 uses a direct-impingement gas system and accepts parts and accessories for the original M4-style carbine.

To increase accuracy over mil-spec carbines, the SIG M400 features a tensioning device designed into the lower receiver that ensures a tight lockup and eliminates play between the upper and lower receivers. The lower receiver has all the same features as the SIG 516, such as an ambidextrous magazine release and rear quick-detach sling mount. Both receivers are machined from 7075-T6 aircraft-grade aluminum forgings and coated with a durable phosphate finish.

The upper receiver features an integrated MIL-STD 1913 top rail for mounting optics and accepts most M16/AR15-style accessories. The carbine arrives with a six-position collapsible polymer stock. An Enhanced version of the SIG M400 features all Magpul equipment.

Chambered in 5.56 NATO, the SIG M400 will be available in semi-automatic for commercial users. Three-round burst or fully automatic versions will be available for military and law enforcement. Built to full military specifications, the SIG M400 features a 16-inch chrome moly steel barrel with a chrome-lined chamber and bore. A direct-gas impingement system operates a seven-lug, rotating bolt. The muzzle is threaded ½ x 28 TPI to accept a variety of flash hiders, compensators or suppressor mounts. An M16A2 flash compensator is included.

A removable sight assembly and carry handle, 30-round magazine and hard case are standard features on this rifle.

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Comments (8)

Displaying 1 - 8 of 8

Ron Gunner Retzlaff @ 9/30/2011 1:51 PM

This will surely be another quality built Sig product. I want one!

smokey @ 10/5/2011 4:56 PM


Lakotah @ 10/10/2011 4:12 PM

Smokey must be smoking crack. If your first and only Sig purchase is the Sig 250 then you missed the boat. You probably purchased it with the intent of purchasing every caliber barrel so you could change it on the fly right??? Sig has several good models to choose from. Dont knock them because you didnt research before you made a bad purchase. Every manufacturer is entitled to a less than stellar model.

Brian @ 8/9/2012 9:31 PM

Um.....Sig doesn't make junk. Was issued a Glock 17 As a police officer in 1993. I said thanks and put it in my closet. Bought a P-226 at my own expense and carried it on duty. Qualified 5pts higher with it too. I'll bet my life on Sig. That's why I'm going to buy the M400.

Jeremy @ 9/17/2012 5:34 PM

Nothing compares to a Sig The best firearms you could purchase!

Greg @ 10/15/2012 7:26 AM

I have one of these. 1500 rnds of mixed ammo, surplus, cheap steel, PMC, Heters, Federal, 55 grn, 62 grn. The gun is ABSOLUTELY flawless and dead nuts accurate. Not one single FTF, FTE, FTL. Perfect. One little complaint. I don't like the sling holes on the side of the lower recevier.

Louis @ 11/16/2012 1:43 PM

If I decide to purchase the M400 can I swap out upper later on and chamber for .308?

Greg Nauman @ 1/5/2013 3:44 PM

Why do you not like the sling holes on the side of the lower?

Seems these would be great for a single point sling with a QD

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