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SIG SAUER, Inc., the leading manufacturer of commercial, law enforcement and military firearms, introduces an improved version of the current 5.56x45mm military issue centerfire tactical carbine, the SIG M400™.

The SIG M400™ has been introduced for consumers who prefer the direct impingement gas system and have an inventory of parts and accessories for the original M4-style carbine. Built with SIG SAUER® quality and reliability, the SIG M400™ is also an exceptional value for those seeking an AR-platform rifle.

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 accuracy-robbing 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.

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The upper receiver features an integrated MIL-STD 1913 accessory top rail for mounting optics and accepts most M16/AR15-style furniture. A six-position collapsible polymer stock offers adjustability to fit all shooters. An Enhanced version of the SIG M400 features all Magpul® furniture.

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 made available for military and law enforcement. Built to full military specifications, the SIG M400™ features a 16″ 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.

Source: SIG Sauer

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