NEW: Ruger AR-Lower Receiver – Another Option for your AR Build

Ruger AR-Lower Receiver

It was only a matter of time. Ruger catalogs ammunition, knives, modern sporting rifles, revolvers, handguns, and even silencers. Now they can add stripped lower receivers to their burgeoning resume. The Ruger AR-Lower Receiver was quietly announced November 22nd, and will soon hit store shelves.

If you own a Ruger AR-556 rifle or have at least fondled one, then you have seen the stripped lower receiver that Ruger is selling. Like most others on the market, it is Mil-Spec and interchangeable among an array of industry parts.

Ruger has this new product offering kind of hidden on their own website. It does not have a dedicated page to view it like most of their products. Instead, if you visit their AR-556 page it is about half-way down. You can find it HERE.

Sturm, Ruger & Company, Inc. had this to say about their lower receiver:

This affordable, American-made modern sporting rifle lower receiver is CNC-machined from forged 7075-T6 aluminum, is Type III hard-coat anodized and makes a great centerpiece component to those looking to build their own modern sporting rifle.

Ruger AR_Lower ReceiverRuger does note in an e-mail sent out to distributors and dealers that it is just a lower receiver. Internal components or a lower parts kit are to be bought separately.

The current MSRP of the Ruger AR-Lower Receiver is $129. This drops it right into the same ballpark as many industry standards like Anderson Manufacturing. So in reality, it should sell anywhere from $60 – $100.



Hello everyone! The outdoors, Crossfit, and anything firearm related have always been my passions. I’ve been a guest writer for Sierra Bullets, am a Smith & Wesson Armorer, reloader, and have an addiction to classic S&W and Colt revolvers. Be sure to visit TFB frequently and keep your magazines full, my friends!


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  • USMC03Vet

    Confirmed mil spec? This is Ruger after all and they’d ruin a wet dream lately.

    • valorius

      I have a Ruger AR556, it’s a fantastic rifle. Very accurate.

    • Patrick R. – Senior Writer

      If by mil-spec you mean “fits AR things” than sure. It is a solid lower and appears well made, but mil-spec is just a industry term that means fits with other AR things.

  • Twilight sparkle

    Matrix aerospace was supposedly making the lowers for ruger before and I managed to get my hands on a matrix lower, probably on par with aero precision just without the set screw

    • Klaus Von Schmitto

      There’s a set screw in AP lowers? What’s it for?

      • Joseph Smith

        To create tension on the upper.

        100% optional. Great idea if you ask me.

        • Klaus Von Schmitto

          Sounds interesting. I’ve always used the little drop in plastic doohickey but a set screw sounds right.

          • Joseph Smith

            It has a nylon tip too so it won’t dig into the upper.

          • Ebby123

            Its typically a spring plunger set screw, it just eliminates rattle between the receivers. I’m a fan. You can do it to any existing AR lower with a drill, a tap, and the plunger screw from McMaster-Carr (part # 8495A21)

            https://www.mcmaster.com/#standard-spring-plungers/=15a4i6r

            The plunger makes contact with the bottom of takedown pin block on the upper receiver.

          • MarcoPolo

            Thanks for posting this. The Sig MCX uses a plunger like this and it’s a really nice setup. I’ve been meaning to see if I could find the correct part to retrofit into another rifle.

          • Ebby123

            Check the length to make sure it fits within the envelope of your platform, but yeah, other industries use these little doodads for all kinds of things.

          • Wingbert

            The doohicky works better if you are using multiple uppers. The plastic tip set screw has to be adjusted with each upper you thrown on it. If you have a upper where the rear lug is .001 longer than it’ll prevent you from pushing the rear pin in. It’s there as an option and options are nice.

    • milesfortis

      Friend’s Ruger AR has the “Keyhole” forge mark for Cerro Forge.
      I think the brand name manufacturers simply source from whomever has stock forgings on hand.

      • Twilight sparkle

        Possibly, I just really liked that matrix aerospace lower, idk if it was the wire edm process they were using but it was a nicer lower than any non billet lower I’ve worked on, plus the roll mark was simple

  • Anonymoose

    Nice 10 round mag, ya got there.

    • Audie Bakerson

      Seriously, did Bill’s ghost design this picture?

      • Anonymoose

        If he had it would be marked law-enforcement only, take rotary mags, and have a montecarlo stock.

        • marathag

          And be difficult to take down.

  • Joe

    Anderson’s can be found now for $45. I’ve seen Aero’s in the $60 range.

  • Daniel

    I don’t get why manufacturers who CNC machine lowers don’t machine the trigger guard as well. We all have or know someone who has broken a tab off their lower trying to install the trigger guard. I’d bet they’d either sell more of them or be able to tack another $5 to the price if they did.

    • iksnilol

      Counterpoint: why even bother installing the trigger guard? It’s not like it does anything important.

      • JustAHologram

        Granted the mag well blocks alot but it’s just another layer of security against something or someone getting to the trigger

    • Christian Hedegaard-Schou

      The trigger guard is supposed to swing down so you can use it with mittens or gloves in the winter.

    • Wingbert

      It’s how the forgings are made. they’re like that before it gets to the machine shop.

      • Daniel

        Says it’s CNC machined. I would assume the forge is a solid bar. Then the machine takes over. It would be kind of redundant to forge a lower then CNC machine finish it.

        • Wingbert

          It’s actually a pretty common practice in manufacturing. Forging the part to near net shape reduces the number of machining operations and in essence reduces machine time. When machining a lower forging (pictured) only critical dimensions such as the magwell, trigger pocket, buffer tube threads, and various mating areas are touched. If you look closely you will still see the forging lines in the trigger area of a forged lower. While billet lowers starts off as a solid block of aluminum, forged lowers typically come from a near net shape forging pictured below. (Source: I’m a professional manufacturing engineer working at a CNC shop)
          https://uploads.disquscdn.com/images/1d5ca20e753084d378d9f966499b3fc033ba19ca1b50eb38f31164d34221b8e3.jpg

  • Harry’s Holsters

    Because why the heck not!

    I’m sure someone will buy it because it has Ruger on it.

  • valorius

    I bought a Ruger AR556 a few months ago. Most accurate out of the box AR-15 i’ve ever owned. The 1:8 twist seems to really work great in 5.56mm. It’s been 100% reliable so far too, albeit only on a range, not in combat conditions.

  • Ragged Hole

    I really like the direction Ruger is headed, and they have really been pushing all the right buttons and putting out great products!

  • Wingbert

    Great for diehard ruger fans!!!…. crickets

  • car54

    sportsmansguide was offering them on pre order a week or so ago. Don’t remember the exact price but it was very reasonable. I wouldn’t mind have a Ruger lower.

  • Cymond

    I’m honestly surprised by this, considering Ruger’s usual stance on any aftermarket work on their guns. Also, surprised they’re not concerned about diluting their brandname. Now there’s going to be a bunch of homebuilt ARs floating around with the Ruger name on them.

    OTOH, why not? They obviously have the capacity & resources.