SIG’s NEW 556 10″ Assault Rifle

SIG 556 ER features a 16” military grade cold hammer…

SIG 556 ER features a 16” military grade cold hammer forged barrel, chambered in 5.56mm NATO, with a twist rate of 1 in 7”. The flash suppressor uses a standard .5 x 28 TPI thread pattern, ensuring compatibility with after-market accessories. The forearm housing the gas operating system is a vented non-slip polymer featuring the SIG TriRail design with three integrated Picatinny rails for mounting accessories. The optional flip up front combat sight is adjustable for windage and elevation. The Picatinny rail equipped receiver is made of high strength steel with a durable wear-resistant Nitron® finish. The Picatinny rail features an optional flip up rear sight that works in concert with the optional front combat sight, providing iron sight performance and a back up sight option for optics. The trigger housing is machined from an aircraft grade aluminum alloy forging with a hard-coat anodized finish designed to survive extreme conditions. The rifle comes equipped with a smooth two-stage trigger, ambidextrous safety and is designed to accept standard AR magazines. A 30-round magazine is supplied with each rifle. The collapsible buttstock features a rubber butt pad, multiple sling attachment points, and a waterproof battery compartment. The ergonomically designed pistol grip features an integrated storage compartment. Select versions feature a folding stock with the ability to collapse, providing he best of both worlds.

Caliber 5.56mm NATO
Overall Length 37.0″
Length w/ Stock Collapsed 33.5″
Barrel Length
Rifling 1 in 7″
Sight Radius 21″
Forearm Polymer SIG TriRail
Weight w/o Mag 7.8 lbs
Operating System Gas Operated, Rotating Bolt
Mag Capacity 30 Rounds
CA Compliant No
MA Compliant No

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Load Comments
  • Eric R. Poole

    Ah yes, shooting. I have a few different angles (short clips of video) demonstrating the rate of fire and control that is acheived through the design of the 10″-barrel 556. I will see if they can get posted for you. Thanks for the comments! – Eric R. Poole

  • Eric R. Poole

    You got me on that one! It was kind of an experiment to see if video would be interesting to Tactical-Life viewers. It was a handheld piece I did as a side to my assignment. If all goes well and people like the video aspect of reporting new products, we’ll get better at it. -Eric R. Poole

  • ADAM


  • Laura Bowen

    This is an interesting evolution of SIG’s 556 and Mr. Harris did a nice job describing it, but the video footage can best be described as a tragedy….