Black Rifle Depot

AR 15 Lower Build Kit

(276 reviews) Write a Review
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Now: $79.95
Was: $99.95



AR 15 Lower Build Kit

The AR 15 Lower Build Kit from Black Rifle Depot stands as the pinnacle of excellence for those keen on crafting or upgrading their AR 15 or related lower receiver. This all-inclusive package delivers everything crucial for your assembly needs: a versatile 6-position Mil-Spec Stock adorned with a sling attachment, an industry-standard OEM AR 15 Lower Parts kit, a top-tier Complete Mil Spec Buffer Tube Kit accompanied by a US-made Stock, a 3 oz buffer, the trusty castle nut, a durable end plate, and a robust carbine spring. Emphasizing its dedication to premium craftsmanship, the Mil-Spec Lower Parts Kit, meticulously designed and produced in the USA, ensures your lower receiver assembly is smooth and flawless. Entrust your build to a kit with quality and durability; every component is shielded by Black Rifle Depot's unwavering lifetime warranty. Catering to both the adept craftsman and the budding DIY enthusiast, the Black Rifle Depot AR 15 Lower Build Kit delivers the essential components and the assurance to finalize your lower receiver project with unmatched confidence.


  • MIL SPEC LOWER PARTS KIT (American Made)
  • Complete Buffer Tube Kit W/Stock (American Made)
    • 6-position 6061-T6 Aluminum Receiver Extension
    • 3 oz Buffer
    • Castle Nut & End Plate
    • Carbine Spring
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Warranty Information

This kit comes with our LIFETIME WARRANTY* in the rare case you need one. Each part is personally inspected for quality and hand packaged to ensure your satisfaction. *Note: Warranty only valid when used with mil-spec lower, warranty does not cover use with 80% lower.
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276 Reviews

  • 5
    Great Product

    Posted by Joe on Oct 10th 2023

    Great Product for the price. Fast shipping. Good service.

  • 5
    Every thing fits perfectly

    Posted by Larry Roberts on Oct 5th 2023

    Best by far compared to others

  • 4
    Overall good, a few problems

    Posted by Donald on Apr 5th 2023

    Overall it is a decent functional kit. Nothing fancy but has everything you need to complete a stripped lower. Problems. The selector switch was missing from the kit. I contacted BRD and they are sending one out. The springs for the take down pins were just a hair long. I had to clip off about 2-3 coils in order to get them to fit. I don't know if that was a kit problem or a lower problem. The trigger guard was present and came with a standard roll pin but the front detente wasn't present. There was nothing to hold the front of the trigger guard in place. Fortunately I had ordered a B5 trigger guard that came with a small screw for the front or I would have been SOL. Lastly, although not a problem, be aware that the screw for the grip is a hex head screw. This was my first build and I wasn't aware that was an standard feature. Luckily, I had the tools for this but not everybody does. So make sure you have a long enough hex driver to install the grip. For the money it seems like a decent functional kit and if I decide to build a low cost lower again I would consider using it. Just inspect everything really well before you start installing.

  • 5
    Nice kit worth thr mony will buy again

    Posted by John Stamos on Sep 13th 2022

    Will buy again

  • 5
    Very nice quality

    Posted by Billy Roark on Sep 7th 2022

    Nice product easy install, I've bought several these are hard to beat for the price

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