SIG-TAC SB15 AR-15 Pistol Brace

When Sig announced their SB15 Stabilizing Brace many in the gun community were surprised it was approved by the BATF.  The device attaches to an AR15 pistol buffer tube and allows the shooter to stabilize the handgun by placing their forearm through an opening in the device and then tightening it down with a velcro strap.  The device looks like a conventional AR15 collapsible stock but in the eyes of the BATF isn’t not.  It’s a “brace” that’s not intended to be shouldered by the shooter.  The material used to make the SB15 is rubbery in feel and is pliable, it’s not hard plastic like a conventional M4 style stock.

The Sig SB15 attached to Jeff's AR15 pistol.

The Sig SB15 attached to Jeff’s AR15 pistol.  Here you can see the length of the SB15 is easily adjusted extending the rear of the pistol out several inches from the back of the buffer tube.

Despite the intent of the design, the SB15 equipped pistol can be shouldered like a conventional rifle as I’ve seen people doing it.  However, I’ve also seen people shouldering AR15 pistols using the stumpy buffer tube as a make-shift stock long before the SB15 came onto the market.  Surely the ATF considered people would shoulder the pistol with the device thus skirting the spirit of the NFA laws, in particular those governing short barreled rifles.  So how did this device slip through the technical branch and actually receive a letter of approval making it legal to own and use?  I couldn’t tell you, but I’m not complaining about it.  I also don’t know the legalities of firing the SB15 equipped pistol from the shoulder, even if it’s not really practical.  Will it get you into trouble if you are caught firing it from the shoulder?   Who knows, but I personally wouldn’t want to be the one who gets to test it in court.  The supplied ATF letter reads, “Based on our evaluation, FTB finds that the submitted forearm brace, when attached to a firearm, does not convert that weapon to be fired from the shoulder and would not alter the classification of a pistol or other firearm.”

This accessory was designed by veteran Alex Bosco to assist a disabled veteran who was having a hard time shooting his AR15 pistol.  The benefits became obvious to the designer and those who had a chance to shoot the prototypes, now all they needed was a way to manufacture it.  That’s where Sig comes into the picture. Sig will bring the device to market as the SB15 with a price at around $150 and it should be available sometime this summer.  Every device sold will have a portion of the proceeds donated to HAVA, a group that helps disabled combat veterans. This alone makes me want to buy one even though I don’t own an AR15 pistol — yet.

Jeff (aka Bigshooterist) takes us on a pre-release tour of the Sig SB15 and shows us how it works.


MAC is an avid shooter, former MCSF Marine, NRA member, Oath Keeper and is commissioned as a Colonel by the Governor of Kentucky. Known for his videos on the Military Arms Channel, he also writes for The Bang Switch, for Shotgun News (Be Ready!) and freelances for Guns & Ammo. MAC has been a life long shooter who has an interest in all things that go "bang" but gravitates towards military type firearms.

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  • jds

    I think, since I live in a free state, I will just pay the extra $50 and go the SBR route.

  • Jason

    If you fire a glock with the grip against your shoulder it does not make it a shoulder fired weapon, and if you look at the handgun definition it specifically states designed to be fired with one hand. Adding a forward grip makes one a AOW because you have changed the design, but if you hole it with two hands it does not change the design.
    Clear as mud right?

  • Ian

    If you do fire it from the shoulder what are the consequences? Is it an unlicensed SBR at that point?

  • Tim U

    From the video, it doesn’t look like it’d be very stable as a stock/firing from the shoulder. There’s nothing on that tube that keeps it from moving around/collapsing on you.

    Did I miss something?

    • Jeff

      It is a very tight friction fit and will not move once on the tube unless moved intentionally. If it WERE Ok to fire from the shoulder it would work fine. I hope this helps. :-)

  • Evan

    Looks like we can get an “SBR” in Michigan with this thing now. Heyo!

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  • Michael Stratton

    There’s an AK version of that brace, but given the cost I’d just rather do the SBR route.

  • http://smith joe

    But if you sbr you can’t leave the state at will and big brother knows you own it. Not so with the brace. I prefer to hide from the gov

  • Dan

    Good point. It’s not how you use it, agreed? It’s what it was “designed” to do.

    That’s the differentiation, and what ATF rulings/definitions are based on.

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  • axsel

    So the question thats been on my mind is if i already own a AR-15 “rifle” can I put a 12″ barrel on it and a SB15 stock or does it have to be a AR “pistol” from the factory aka the serial number has it as a pistol not a rifle if the serial number was ever run

    • Captain Bob

      It has to be originally manufactured as a pistol. You cannot change it from a rifle to a pistol. You can change a rifle to an SBR (short-barrelled rifle) but it’s still a rifle and then you have an NFA weapon which means you have to pay the tax and get permission first.

  • one2boost

    So what is the latest news on this thing? Current news being passed around on various firearms forums are, BATF supposedly back pedaling and changing it’s stance on it’s previous statement. In these forum posts, actual pics of the letters from BATF were posted.

  • disqus_6npiJ7fVP4

    The ATF just rescinded their approval…

  • no_tubes

    I’m not sure how paying a fee and begging for permission makes one ‘free’.

  • Scott Willoughby

    Sbr route cost $200 not 50$. If you lived in a truly free country or state you wouldn’t need permission or have any fees