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



JMT’s beefed up and redesigned Gen 2 Polymer 80% Lower is now available in .308 and 7.62 NATO. Build an AR-10 clone or accurate bench rifle and enjoy critical weight savings without sacrificing reliability.

Upgraded Polymer

This receiver blank was massively reinforced, tested, and re-tested by JMT to guarantee it handles any .30-cal loads you slam through the muzzle. JMT took their existing polymer fiber and upgraded it to be tough, stiffer, and harder, ensuring your receiver is utterly reliable.

LR-308 / Mil-Spec Compatibility

Its 100% mil-spec construction accepts all .308 DPMS components, mil-spec buffer tubes, standard .308 LPKs, and your favorite Magpul magazines. The mag well’s even cut to match! This receiver includes the 80% jig required for drilling the LPK pin holes and trigger cavity, making it a great value for completing your LR-308 or AR-10 clone on a budget. 

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.

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).

No FFL required  Made in the USA  Lifetime Warranty

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.