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JMT 80% Lower and Jig - .308, Polymer, Green

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The LR-308 rifle or AR-10 clone you just built doesn’t need to weigh close to 20 pounds. Between that big barrel, variable-zoom optic, bipod, and bench-ready Magpul buttstock, you’re already tipping the scales. To shave the ounces off your rifle wherever possible, try out James Madison Tactical’s new lightweight Gen 2 Polymer 80% .308 Lower, this one being in the OD green color.

Reinforced Polymer

This DPMS gen 1 compatible receiver blank has been dramatically upgraded to reliably handle the heft and recoil of any .308 or 7.62 NATO loads you send downrange. JMT also put this lower through the gauntlet after upgrading its polymer-fiber material to be tougher, stiffer, and harder, which means it’s truly capable of handling rapid fire, high heat, and high impacts.

LR-308/Mil-Spec Compatibility

This JMT lower receiver is mil-spec and compatible with all DPMS gen 1 LR-308 parts. It’s even cut to match your favorite Magpul mags! Completing this 80% lower is too easy, thanks to the included jig for cutting and drilling your pin holes and fire control group cavity.

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.

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.

.308 Winchester
James Madison Tactical
Polymer Composite

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.