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Magpul® MOE® AR-15 Lower Build Kit

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Once you've grabbed a stripped lower or 80% lower (sold separately) you'll need a parts kit like this one. It provides the internals for your receiver, making it functional. In addition to its mil-spec parts, this kit includes upgraded Magpul® parts! 

MOE® Lower Build Kit: What's Included

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 Retainer Spring
  • Disconnector
  • Disconnect Spring
  • Steel Hammer
  • Hammer Pin
  • Hammer Spring
  • Magazine Catch
  • Magazine Catch Button
  • Magazine Catch Spring
  • Pistol Grip (A2 style)
  • Pistol Grip Lock Washer
  • Pistol Grip Screw
  • Pivot Pin
  • Pivot Pin Detent
  • Pivot Pin Detent Spring
  • Selector
  • Selector Detent
  • Selector Detent Spring
  • Takedown Pin
  • Takedown Pin Detent
  • Takedown Pin Detent Spring
  • Trigger
  • Trigger Guard
  • Trigger Guard Roll Pin
  • Trigger Pin
  • Trigger Spring

AR-15 Buffer Tube Assembly

  • Mil-spec dimensions
  • Six-position buffer tube
  • Accepts all standard AR-type stocks

Magpul® MOE® Carbine Stock

The Magpul® MOE® Mil-Spec Carbine Stock is light, comfortable, and tough. Its adjustment latch is shielded from being accidentally moved or snagged.

Magpul® MOE® AR15/M4 Grip

Let's face it: The AR's OEM grip just isn't that comfortable. Magpul® fixed the issue with their MOE® AR15/M4 Grip. It has a noticeably steeper grip angle. No more contorting your wrist to get that high grip purchase.

Magpul® also make the grip thicker than the mil-spec grip, for better comfort. And they've turned the inside into a compartment to store gun oil or batteries.

Magpul® MOE® Enhanced Trigger Guard

The Magpul® MOE® Enhanced AR15/M4 Polymer Trigger Guard is way better. It's ergonomic and gives your trigger finger much more room which is great if you're wearing gloves.

Easy-to-Follow Install Instructions

Follow our step-by-step picture and video guide to install your AR-15 Lower Build Kit. You'll also need some basic tools, like an Armorer's Wrench, and Roll Pin Punches with a Gunsmithing Hammer.

Guide: How to install the AR lower parts kit.

Completing Your AR-15 Build

Make finishing your AR-15 even easier! Check out our available barreled uppers.



WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov

Shipping Restrictions

Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily.

80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.


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.