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AR Lower Parts

  • Gun Nuts®  0# $#!+ Kit - Lower Parts Kit Gun Nuts®  0# $#!+ Kit - Lower Parts Kit Gun Nuts®  0# $#!+ Kit - Lower Parts Kit Gun Nuts®  0# $#!+ Kit - Lower Parts Kit

    Gun Nuts® 0# $#!+ Kit - Lower Parts Kit

    Lost that tiny lil' spring? You're in the right place. The "OH $#!+" Lower Parts Kit provides replacement components for the AR-15 lower receiver's springs, pins, and detents -- including all the parts most likely to get lost or damaged during the...

    $11.99
  • Gun Nuts® Pro Line Fire Control Group Gun Nuts® Pro Line Fire Control Group Gun Nuts® Pro Line Fire Control Group Gun Nuts® Pro Line Fire Control Group

    Gun Nuts® Pro Line Fire Control Group

    The Pro Line FCG: OEM compatibility with tier-one performance. A simple hammer and trigger upgrade is one of the most overlooked AR-15 upgrades -- and it's one of the easiest and most effective ways to improve your AR's reliability and accuracy. Enter...

    $26.99
  • Sale
    Magpul CTR® Carbine Stock – Mil-Spec Magpul CTR® Carbine Stock – Mil-Spec 2 Magpul CTR® Carbine Stock – Mil-Spec 3

    Magpul® CTR® Carbine Stock - Mil-Spec

    The Magpul CTR Carbine Stock has a light, anti-snag, A-framed design that protects the latch from accidentally releasing. Designed as a lightweight upgrade to the AR-15's original six-position adjustable stock, The Magpul CTR Stock provides the same...

    Was: $56.95
    Now: $49.97
  • Sale
    Ergo Grip Sure Grip for AR-15/M16 Ergo Grip Sure Grip for AR-15/M16

    Ergo Grip Sure Grip for AR-15/M-16

    If you're someone who frequently uses your AR for long durations, then comfort is paramount. You need to reduce fatigue in your grip hand however possible. With that in mind, Ergo Grip gives your their Sure Grip for AR-15/M-16. First, it's shaped and...

    Was: $29.99
    Now: $26.99
  • Sale
    Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube

    Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube

    You may consider the buffer tube to be nothing fancy, and "just one of the pieces" you need to make your AR-15 build work. And while it's true you need one, it can be true at the same time that having the right one can enhance your building and shooting...

    Was: $44.99
    Now: $39.97
  • Sale
    Gun Nuts® Pro Line Lower Parts Kit Gun Nuts® Pro Line Lower Parts Kit Gun Nuts® Pro Line Lower Parts Kit Gun Nuts® Pro Line Lower Parts Kit

    Gun Nuts® Pro Line Lower Parts Kit

    Precision machining for improved performance. The Pro Line AR-15 LPK provides the best in American engineering, affording precision-cut fire control components that ensure the highest reliability out of the box. Coupled with a consistent, smooth trigger...

    Was: $72.99
    Now: $59.97
  • AR15 LPK - Basic Build Kit

    AR15 LPK - Basic Build Kit

    The Kak Industry AR15 Lower Parts Kit comes with all of the basic essentials you'll need for your own custom AR15 build. This build kit includes the following: bolt catch kit magazine catch kit hammer & trigger pins pivot pin & detent &...

    $27.99

 All the parts you need to get your AR's lower ready for an upper.

The piece-by-piece nature of building the AR-15 can get a little overwhelming, especially if it's your first time. That's why we've compiled all the AR-15 parts that you need to complete the "lower half" of your rifle or pistol. With a fully built lower assembly, you can attach a barreled upper receiver, slap in a magazine, and start hitting targets at the local range.

Parts Required to Finish Your AR's Lower

In addition to a fabricated 80% lower receiver or AR-15 stripped receiver bought from an FFL, you'll need the following components which can all be found right here:

  • Buffer tube
  • Buffer
  • Recoil spring
  • Butt stock or brace
  • Lower parts kit (includes hammer, trigger, safety, springs and pins)

New builder? Use our Master guide to pick the right lower parts.

Drop-in Trigger Upgrades

One of the easiest ways to upgrade your AR before you even finish your build is by simply swapping out your factory trigger setup for a drop-in unit, like the ones available from ACT and Rise Armament. These self-contained triggers include the trigger, disconnector, and hammer preinstalled. All you need to do is drop the unit into the receiver, and tap in your pins!

Need help with assembly? Here's how to install the AR-15 lower parts kit.

 


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DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80-Lower.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.