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Sig Sauer TREAD M400 SDI X-Series AR-15 5.56 NATO Rifle - 16"

AR-15 Rifle

Out of stock

FFL Required Before Shipping.

Please have your dealer email a copy of their FFL to [email protected] or fax it to 253-218-2998, referencing your name and order number.


The SIG SAUER M400-SDI XSERIES packs a rich set of features and upgrades into the M400 platform delivering an advanced performance rifle right out of the box. The M400 XSERIES lower features fully ambidextrous controls, including bolt catch & release, selector switch, charging handle and mag release. Also unique to the XSERISE is a precision machined lightning cut upper and lower with a handguard clamp system designed to minimize deflection when using mounted accessories. Other features include a hybrid flash hider/compensator, 2-Stage Matchlite Trigger and Magpul SL Telescoping Stock.


  • CALIBER: 5.56 NATO
  • BARREL LENGTH:  16 in [406.4 mm]
  • MAGS INCLUDED: (1) 30rd Polymer Mag
  • MAG TYPE: AR-15
  • ACTION TYPE: Semi-Auto
  • STOCK TYPE: Magpul SL Stock
  • BARREL MATERIAL: Chrome / Moly Steel
  • TRIGGER TYPE: SIG Flat Blade Match
  • TWIST RATE: 1:7
  • FOREND TYPE: Alloy
  • GRIP TYPE: Polymer
  • RECEIVER FINISH: Black Anodized
  • OVERALL LENGTH: 33.5 in [851 mm]
  • OVERALL WIDTH: 2.8 in [69.8 mm]
  • HEIGHT: 7.5 in [191 mm]
  • OPERATING SYSTEM: Direct Impingement
  • WEIGHT: 7.0 lb [3.18 kg]
More Information
Product Type AR-15 Rifle
Manufacturer Sig Sauer
Twist Rate 1:7
Color Black
Mount M-LOK
Barrel Length 16"
Caliber 5.56 NATO

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