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JMT AR-15 80% Gen 2 Polymer Lower with Jig - Black

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Worried that a polymer lower receiver isn’t up to the task of handling your AR’s constant abuse? We’re excited to bring in the new Gen 2 Polymer 80% Lower from James Madison Tactical! This ultralight JMT lower includes the necessary 80% jig for cutting and drilling the fire control cavity, and it includes beefed up designs and upgrades to ensure it’s truly battle-ready. 

Stronger, Tougher Polymer

JMT took extra time to develop their reinforced polymer for this new 80% lower. Engineers incorporated a way tougher polymer-fiber construction that can withstand rapid fire, high heat, and the rigors of the high impacts, the hunt, or any 3-gun competition.

Parts Compatibility

Considered 100% mil-spec, this ar 15 polymer lower is compatible with any “retail” AR components, including standard LPKs, buffers, and grips. JMT even cut the mag well to perfectly match your favorite Magpul magazines.

Upgraded Features:

  • Extended upper fire control box sections.
  • Upper left magazine well box section.
  • Webbed magazine wells match Magpul mags.
  • Extended bolt release roll pin posts.
  • New JMT Gen2 logo markings.

Manufacturer instructions can be found here.

No FFL is required to purchase this lower receiver. This polymer 80% lower receiver is not considered a firearm and is compliant with ATF receiver blank determinations (Gun Control Act of 1968). Not classified as a firearm as defined in 18 U.S.C. 921(a)(3).

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:

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

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James Madison Tactical

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.