San Tan Tactical STT-15 Lower

santan ar-15

San Tan Tactical is making an AR-15 lower that was designed to be completely ambidextrous, including the magazine release and the bolt release.  Additionally, the lower has integrated QD sling attachment points on both sides.

san tan lower

The magazine well is flared for faster reloads under stress.  According to San Tan Tactical, “We took the flare out as far as we could which makes it able to accommodate all magazines including the large drum magazines & Surefire high capacity magazines.”  San Tan Tactical successfully tested the lowers with a wide range of magazines including all 20- and 30-round STANAG magazines, all 10-, 20-, and 30-round Magpul magazines, 60- and 100-round SureFire magazines and more.

santan ar-15

The company states the STT-15 is compatible with “all mil-spec AR-15/M-16 components.”  MSRP on the lowers is $399.99.  At the time this article was written, the company had an introductory special price of $379.99.

Richard Johnson

An advocate of gun proliferation zones, Richard is a long time shooter, former cop and internet entrepreneur. Among the many places he calls home is


  • Raven

    $400 for a lower receiver? Are you kidding me?

    • scout706

      Glad it’s not just me thinking that price is…optimistic?

    • sianmink

      A stripped Mega ambi lower runs about 230, and this one comes with pretty much evérything but the trigger, so it’s not TOO far off.

    • TangledThorns

      I see they have a introductory special at $380.

    • FWIW

      Welcome to the firearms industry, where every vaguely innovative product necessitates a 4x markup of what most people would consider the reasonable price…Still though, it could just be that these guys don’t have much capacity right now, so they’re pricing it such that they don’t get overwhelmed. I dunno.

  • Pooshoes

    Good luck with that SantanaTactical.

  • Yond

    That trigger looks very uncomfortable for $400 lower :/

    • Sadler

      Flat triggers are absolutely fantastic to shoot with. They offer greater control and lighter perceived weight over the traditional trigger. You should give them a try.

    • BoHeck

      Geissele Super Dynamic trigger…one of many triggers available from the best AR trigger manufacturer there is currently.

      $400 is steep for a lower, but digging a little deeper, I can see the cost is justified. The lower is made machined from billet 7075, which literally cost twice as much as 6061. Most billet lowers are 6061 because it’s cheap and are sold for $200 to $300. So the raw material costs have doubled, machining has time has increased to include quick disconnects and ambidextrous components which would otherwise not need slots milled. And another huge cost is developing and manufacturing their own ambi components from A2 tool steel, which come installed on the lower.

      Would I buy it? No, I’m not a lefty and really have no use for a full ambi gun. Is the bang for the buck there? Absolutely, considering the craftsmanship and attention to detail involved.

  • J_Kusanagi

    Funny everything is ambi except the selector, which is the easiest thing to make ambi. I dig the integrated rear QD slots and extra-flared magwell… all new-design AR lowers should have these. Also, the indentations in the back of the magwell to rest your finger when not firing is a nice attention to detail. If it was marked for a 45-degree selector it would be pretty close to my perfect setup for an AR lower (handling the Robinson XCR has shown me how convenient short throw selectors are).

    Since the Carbine Competition has been canceled, wasn’t the military’s fall back plan to take the M4 as it is now and just make all the controls ambi? I’m hoping to eventually see a “standardized” ambidextrous control design rather than a bunch of proprietary ones from various manufacturers…

    • Cymond

      I admit, I haven’t tried the Battle Arms short throw safety, but I really like the Noveske short throw safety. It’s 60 degrees instead of 45 degrees, but it also costs half as much and fits in a standard lower.

      • mig1nc

        I love my Noveske STS as well.

  • sneezer

    the argument that the aluminum costs twice as much, is moot. I work in the metals industry and I would say 1.5x as much, is closer. That being said we are talking about only 3-4lbs of raw material so we are looking at about 12-16 dollars more for 7075…even at 2x material costs….. it is a non-factor in this application

    • mig1nc

      Considering you can buy a blemished lower for $60, yeah, I suspect materials cost is a non-issue as well.

  • Clint Notestine

    … so no go in California

    • Cymond

      If the laws pass, almost all ARs will be no-go in California.
      However, if you’re referring to the ambi mag release (and how it won’t work with a bullet button), you could currently build one of these lowers as a “featureless” rifle.

    • Cymond

      Yes I know “Firearms, not Politics” but just a short update, SB 47 & SB 274 did NOT pass in California, so nothing has changed. You definitely can build a STT-15 receiver as a “featureless” rifle in California. I personally think the Thordsen Custom FRS-15 stock looks like a good option for a featureless build.

  • Cymond

    It looks like this is competition for the AXTS AX556. Yeah, it’s expensive but it also has a lot of innovative, proprietary parts. It may not cost much to produce, but it probably took a fair bit of time & money to work out the design bugs.

  • Brandon

    A little on the pricey side.
    People will buy them anyway. Most the people with Black Rifle Disease already have half a dozen rifles but can’t stop.

  • Mike Armentrout

    The article does not advise that the sst15 also has upper receiver tension adjuster. I know so do others is Sun Devil. Also has a built in trigger pre travel take up screw and a recessed threaded hole for the selector detention and spring with a flush Allen set so that grips can be changed without the spring and detent launching. Again maybe not needed but extra features not listed here. The controls are A2 tool steel made in house and golf ball treated for texture. I do not work for them but have been there and seen them being made.