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    Mil-Spec AR15 Lower Parts Kit (w/ Hammer and Trigger)

    Mil-Spec AR15 Lower Parts Kit (w/ Hammer and Trigger)

    Complete AR-15 Lower Parts Kit with Pistol Grip This AR-15 Lower Parts Kit includes all components required for assembling your AR-15 stripped lower receiver: Bolt Catch Bolt Catch Plunger Bolt Catch Roll Pin Bolt Catch Spring Buffer Retainer Buffer...

    Was: $49.99
    Now: $39.99
  • Sale
    LR-308/AR-10 Lower Parts Kit (w/ Hammer and Trigger)

    LR-308/AR-10 Lower Parts Kit (w/ Hammer and Trigger)

    NOTE: Due to availability limitations and supply chain constraints, slight variations of the trigger and hammer finsh (stainless or black) may occur.  Acquire an LR-308 trigger that suffers no creep, take-up, or over-travel. Acquire an...

    Was: $69.99
    Now: $59.99
  • KAK Missing Parts Kit - AR15 LPK

    KAK Missing Parts Kit - AR15 LPK

    The Kak Industry AR15 Lower Parts Kit is perfect for any parts that may be lost, need to be replaced, or for your next custom build. LPK includes, a buffer retainer (1), takedown and pivot detents (4 each), selector detent (2), selector and ejector...

    $9.99
  • Spike's Tactical - Lower Parts Kit AR-308

    Spike's Tactical - Lower Parts Kit AR-308

    The Spike's Tactical AR-308 Lower Parts Kit has a great fit and finish along with a military grade design that is built for longevity. This parts kit is designed to be used with Spike's Tactical's forged sets and may not be compatible with any other...

    $79.99
  • Premium AR-15 Lower Parts Kit Premium AR-15 Lower Parts Kit 2 Premium AR-15 Lower Parts Kit 3 Premium AR-15 Lower Parts Kit 4

    Premium AR-15 Lower Parts Kit

    This kit contains all the necessary internal parts to finish off your lower receiver.  The difference between this and other LPKs out there is that this one has been upgraded with a Magpul MOE grip and trigger guard from the standard varieties. This...

    $63.99
  • Spike's Tactical Lower Parts Kit for .223/5.56

    Spike's Tactical Lower Parts Kit for .223/5.56

    The mil-spec lower parts kit is alright. I mean it works. It does its job. The trigger, hammer, disconnector, detents, springs, and roll pins are perfectly suited to the job of making your lower (and the rest of your AR) work as intended. As with the old...

    $89.99
  • Aero Precision Enhanced Lower Parts Kit - M5, .308

    Aero Precision Enhanced Lower Parts Kit - M5, .308

    If you're planning to build an LR-308, you already know you'll need a good lower parts kit. It'd also be nice if your lower parts kit came with a more comfortable grip than the odd-angled, standard A2 grip. Aero Precision makes a lower parts kit designed...

    $134.99
  • Strike Industries Enhanced Lower Parts Kit

    Strike Industries Enhanced Lower Parts Kit

    If your .223 or 5.56mm AR-15's lower parts kit needs replaced, or if you just want to refresh its controls, you need to get the Strike Industries Enhanced Lower Parts Kit. It'll rejuvenate your lower assembly, and it also includes the added feature of...

    $104.99
  • WMD Guns Lower Parts Kit -  NiB-X, Mod 3

    WMD Guns Lower Parts Kit - NiB-X, Mod 3

    Your AR uses a certain "balance of parts" to get the performance it does. You can get more out of your AR shooting experience even just by making minor changes to things like your AR's lower parts kit. This lower parts kit by WMD Guns is mil-spec save...

    $119.99
  • Aero Precision M5 .308 Standard Lower Parts Kit

    Aero Precision M5 .308 Standard Lower Parts Kit

    If you're going to start an LR-308 build, you're gonna need a good lower parts kit that won't let you down. Aero Precision makes a lower parts kit designed for their M5, which is their own proprietarily designed .308 rifle that can also work with your...

    $99.99
  • KAK Pin And Detent Kit AR15 LPK

    AR15 Pin & Detent Parts Kit

    The AR15 Pin And Detent Lower Parts Kit by Kak Industry was manufactured with high quality materials. If you're in need of replacement parts, a new build, or having spare parts then this is the perfect kit. Additionally, this LPK includes a pivot pin,...

    $19.99
  • Aero Precision AR15 Enhanced Lower Parts Kit

    Aero Precision AR15 Enhanced Lower Parts Kit

    Kick off your next AR build with a quality lower parts kit for your lower receiver, so you don't just end up replacing it later. To help you do that, Aero Precision gives you their AR-15 Enhanced Lower Parts Kit to start your build off the right way...

    $114.99
  • KAK Basic Build Kit - AR15 LPK

    AR15 LPK - Basic Build Kit

    The AR15 Basic Lower Parts Kit has all of the basic items needed for your own custom build. Featuring in this kit are the following, a bolt catch kit, magazine catch kit, takedown pin & detent & spring, pivot pin & detent & spring, buffer...

    $29.99
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Besides your barrel, the lower parts kit is the most vital component of any AR build. The lower parts kit includes the hammer, trigger, magazine catch, takedown pins, detent springs and other components for assembling your lower receiver. An LPK is necessary to convert your 80% lower receiver from a piece of aluminum to a fully-functioning firearm quickly and cost-effectively, after fabricating it with a jig. We guarantee 100% mil-spec fitment and tolerances in all the kits we sell, so you are not forced into buying a brand-specific, proprietary lower receiver.

Need Help Installing Your LPK?

Use our incredibly detailed and easy-to-follow picture guide! It provides all the steps, parts, and tools required for installing your lower parts kit. Even if you're unfamiliar with the AR platform and you've never done it, you'll be able to with our guide.

Lower Parts Kit Features

  • No FFL Required
  • 100% Mil-Spec Parts
  • Made in the USA

Your build awaits you.

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.