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AR Lower Parts

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  • mil-spec-ar-15-butt-stock-1

    Mil-spec AR-15 Butt Stock

    The original M4-type buttstock. Aftermarket stocks are awesome, but some builders prefer the good ole' mil-spec stuff. This M4 six-position buttstock perfectly replicates the stock found on service-issued rifles. It's made from the same injection-molded...

    $13.99
  • 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
  • LR-308/AR-10 Buffer Tube Assembly

    LR-308/AR-10 Buffer Tube Assembly

    Get yourself a buffer tube assembly that will withstand just about anything. Forged form 7075-T6 aluminum, the buffer tube is not only lightweight, but is extremely durable as well. It's also compatible with most aftermarket adjustable stocks to allow...

    $29.99
  • JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber 2 JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber 3 JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber 4

    JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber

    If you're looking for a simple, yet effective upgrade to your AR to get you out of mil-spec territory with your trigger, then hold up right here. You need to see this. This is the Saber. It's JMT's Single Stage Drop-In 3.5-4 lb Trigger, and it'll...

    $94.99
  • AR-15 9mm Carbine Buffer

    AR-15 9mm Carbine Buffer

    If you're building an AR chambered in 9mm, then standard parts won't do. You need those created to work with the 9mm AR's blowback design. This is the 9mm buffer you need. It's made specifically for 9mm AR rifles and pistols. See below for more info...

    $16.99
  • AR-15 H2 Carbine Buffer

    AR-15 H2 Carbine Buffer

    Mil-spec, 4.6 ounces, fits all standard buffer tubes. This H2 buffer provides a reduction in bolt carrier group travel and increases recoil damping, making it ideal for over-gassed AR-15s, suppressed setups, and super safeties and forced reset selectors...

    $19.99
  • Sale
    AR-9 Pistol Lower Build Kit w/ No Brace

    AR-9 Pistol Lower Build Kit w/ No Brace

    The affordable way to finish your AR-9 pistol build. Need all the lower parts for your AR-9 receiver? Grab this lower build kit! It includes the necessary 9mm buffer, a tube, recoil spring, and LPK for assembling your 9mm AR lower receiver. Lower Parts...

    Was: $84.99
    Now: $79.99
  • Sale
    AR-9 Pistol Lower Build Kit w/ SBA3 Brace

    AR-9 Pistol Lower Build Kit w/ SBA3 Brace

    The affordable way to finish your AR-9 pistol build. Now with a brace! Need all the lower parts for your AR-9 receiver? Grab this lower build kit! It includes the necessary 9mm buffer, a tube, recoil spring, and LPK for assembling your 9mm AR lower...

    Was: $199.99
    Now: $179.99
  • AR15 LPK Missing Parts Kit

    AR15 LPK Missing Parts Kit

    This AR15 LPK Missing Parts Kit has all the essentials for any lost parts, replacement parts, or for your next custom build. All parts are proudly made in the USA. This LPK Missing Parts Kit comes with: (1) buffer retainer (1) buffer retainer spring (1)...

    $11.99
  • AR9 Replacement Ejector w/ Screws AR9 Replacement Ejector w/ Screws AR9 Replacement Ejector w/ Screws

    AR9 Replacement Ejector w/ Screws

    This is a replacement ejector for our AR9 80% Billet Lower Receiver. Features: Made from 17-4 Stainless Steel hardened to RC42 Includes 2 cap screws Lower receiver not included.  

    $11.99
  • AR9 Replacement Mag Catch AR9 Replacement Mag Catch AR9 Replacement Mag Catch

    AR9 Replacement Mag Catch

    This is the replacement magazine catch for our AR9 80% Billet Lower Receiver. Features: Billet aluminum magazine catch Dowel pin, spring and set screw included Lower receiver not included.  

    $29.99
  • AR9 Buffer Tube Assembly

    AR9 Buffer Tube Assembly

    If you're in need of a new AR9 buffer tube assembly kit, then we've got you covered. The buffer tube is crafted from 7075-T6 aluminum which makes it very light and durable as hell. It's even compatible with most adjustable 6-position stocks so that you...

    $44.99
46 of 46 Items

 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.