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Lower Parts Kit

Lower Parts Kit

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.