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JMT 308 80% Gen 2 Polymer Lower with Jig - Black



Piecing together that LR-308 rifle is easy and affordable with JMT’s Gen 2 Polymer 80% .308 Lower. This ultra-light receiver shaves critical weight off your newly minted rifle, improving performance and comfort.

Upgraded Polymer

This lightweight, reinforced receiver was tested, re-tested, and made to take the brute force of any .308 rounds you chamber. JMT took their existing polymer-fiber material and upgraded it to be tougher, harder, and stiffer. It can handle rapid fire, high heat, and high impacts with utter reliability.

Mil-spec/LR-308 Compatibility

This 80% receiver is compatible with any DPMS-pattern .308 components and features mil-spec fittings. Included is the 80% jig required for drilling the hammer, trigger, and safety lever pin holes, as well as an easy-to-follow template for cutting the main cavity to install your LPK. 

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).

Made in the USA Lifetime Warranty

Shipping Restrictions

AR-15Lowerreceivers.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally. 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 (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. We try our best to keep our shipping page current, but laws change daily.

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.