SIG516: Sig Sauer enters the AR-15 market!

    You saw it here first! I had no idea that Sig Sauer were making AR-15 / M16 rifles but my DSEi spy spotted this prototype SIG516 1 PDW at the DSEi 09 expo. It features a 7″ barrel, putting it firmly in the PDW class, and chambers the 5.56mm NATO.

    The SIG 516
    Markings indicate manufacture at the Sig Sauer plant in Exeter, NH, USA

    I do not know if Sig plan on a civilian carbine version. If they did it would compete directly with their Sig 550 line of full length and short barreled rifles.

    UPDATE: jcmiller points out that the lower receiver is semi-automatic. A production PDW would have to be fully automatic. Maybe Sig are thinking of civilian sales.


    The SIG516 Tactical Rifle line has three different models:

    • SIG516 PDW : 7″ barrel. A personal defense weapon (pictured above).
    • SIG516 CQB : 10″ barrel. A Colt M4 Commando equvelent.
    • SIG516 BASELINE CARBINE : 14.5″ barrel. A M4 Carbine equvelent.
    • SIG516 Patrol. 16″ barrel.
    • SIG516 Tactical Marksman: 16″ barrel A squad level sniper / designated marksmen rifle.
    • SIG516 Precision Marksman: 20″ barrel. Possibly a true sniper rifle, or designated marksmen rifle.

    They are all piston operated and feature an adjustable gas regulator like the Ruger SR-556.

    Caliber 5.56mm NATO
    Fire modes single shot, 3 round burst and fully automatic (except marksmen models which are semi only)
    Controls Ambidextrous
    Gas system piston system with 3 or 4 position gas regulator
    Upper Receiver Flat top with picatinny rail
    Lower Receiver forged 7075-T6 aluminum
    Trigger Milspec for all models except the Marksmen which have 2-stage match trigger
    Capacity Takes standard AR-15 magazines
    Finish black hard coat finish
    Barrel chrome lined, cold hammer forged, nitrate finish
    Barrel Twist 1:7″ right hand
    Stock collapsible SOPMOD buttstock
    Weight 6 lbs. (PDW) – 7.28 lbs (Patrol) – 8 lbs (Precision Marksman)
    Rails Free floating aluminum alloy M1913 picatinny quad rails
    Sights flip-up BUIS (backup iron sights)
    Magazine Ships with 30 round AR-15 magazine. Marksmen models ship with 10 or 20 round magazine.
    Other Features 0.5x28TPI threaded muzzle
    MSRP (Price) not known

    Upper receiver assemblies will be sold. Just before anyone gets their hopes up, while it is likely that Sig will sell civilians models, this has not been confirmed.

    Big thank you to Lusaka for the information and photos.

    1. SIG 516 as in M16 … get it? 

    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!