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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 XSERIES 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] – ACCESSORY RAIL M-LOK – OPERATING SYSTEM Direct Impingement – WEIGHT 7.0 lb [3.18 kg]