SIG M400 Direct Gas Impingement Carbines

    Because of popular demand Sig Sauer has developed a line of Direct Gas Impingement AR-15s to complement their line of SIG 516 piston-operated ARs.

    SIG M400

    The SIG M400 features a SIG 516 lower receiver with it ambidextrous magazine release, rear quick-detach sling mount and tensioning device that ensures a tight lockup between the lower and upper receivers. The upper is a standard M4-style upper receiver. The enhanced model features Magpul OEM stock, pistol grip and handguard.

    SIG M400 Enhanced
    Caliber 5.56m NATO
    Capacity 30 rounds
    Barrel 16″ M4 profile
    Twist 1:7
    Overall Length 34.6″
    Weight 5.65 lbs
    Front Sight Post
    Rear Sight Carry Handle
    Trigger pull 7.6 lbs
    MSRP (Price) $1065 (standard model)
    Availability Shipping now
    Steve Johnson

    I founded TFB in 2007 and over 10 years worked tirelessly, with the help of my team, to build it up into the largest gun blog online. I retired as Editor in Chief in 2017. During my decade at TFB I was fortunate to work with the most amazing talented writers and genuinely good people!