Black Rifle Depot

AR 15 Lower Build Kit

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



AR 15 Lower Build Kit

The Black Rifle Depot AR 15 Lower Build Kit is the ultimate solution for anyone looking to assemble their AR 15 or variant lower receiver. This comprehensive kit includes all of the essential components you need, including a 6-position Mil Spec Stock with sling attachment, a standard OEM AR 15 Lower Parts kit, a Complete Mil Spec Buffer Tube Kit with Stock made in the USA, a 3 oz buffer, a castle nut, an end plate, and a carbine spring. The Mil Spec Lower Parts Kit is also made in the USA and includes everything you need to assemble your lower receiver. With this kit, you can be confident in the quality and reliability of your build, as all components are backed by a lifetime warranty from Black Rifle Depot. Whether you are a seasoned builder or a first-time DIYer, the Black Rifle Depot AR 15 Lower Build Kit provides all of the components and peace of mind you need to complete your lower receiver with 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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274 Reviews

  • 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

  • 3
    Nice kit have not been able to install yet waiting for my lower to arrive would have been nice to get assembly instructions since this is my first lower build will re rate later

    Posted by John on Jul 5th 2022

    Nice kit would been nice to get instructions by

  • 5
    Lower build kits

    Posted by Dustin Henderson on Apr 27th 2022

    These kits are pretty basic but I've never had a problem with them . I would recommend this kit to anyone

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