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JMT 308 80% Gen 2 Polymer Lower with Jig and Lower Parts Kit - FDE & LR-308/AR-10

Was: $174.99
Now: $159.98
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James Madison Tactical makes some pretty tough and sturdy polymer 80% lowers. If you're going polymer with your next .308 sized AR build and you want it in the FDE color, JMT's polymer .308 lower would be an excellent choice. Pair it with a high-quality standard .308 sized lower parts kit, and you're off to a great start for your build.

The JMT polymer .308 80% Lower

That new LR-308 rifle 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 critical weight, try out James Madison Tactical’s new lightweight Gen 2 Polymer 80% .308 Lower, now in the FDE color. 

Reinforced Polymer

This DPMS-compatible receiver blank was drastically 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. It’s truly capable of handling rapid fire, high heat, and high impacts. And you'll look all "operator" too when you get it in FDE!

LR-308/Mil-Spec Compatibility

This JMT lower receiver is mil-spec and compatible with all DPMS 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 main 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.

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).

The LR-308 Lower Parts Kit

We strive to provide the most accurate photographs of our product whenever possible. Due to availability limitations and supply chain constraints, slight variations of the trigger and hammer finsh (stainless or black) may occur. 

Want an LR-308 trigger that suffers no creep, take-up, or over-travel? Looking for the easiest-to-install LPK? How about the most affordable parts kit possible? This LR-308 LPK comes in at a low-price with machining and performance that truly feels match-grade.

Perfectly Polished for Performance

Th quality control is second to none and the finish show it: Inside you’ll find a disconnector, hammer hook, and sear that were laser-cut and polished to break as clean as glass at exactly 4.5 pounds. The trigger affords perfect reset after every pull, with no break-in required. Every roll pin presses easily, while the hammer and trigger pins glide in with little effort.

Complete LR-308 Lower Parts Kit with Pistol Grip

This LR-308 Lower Parts Kit includes all components required for assembling your LR-308 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
  • SSteel Trigger
  • Trigger Guard
  • Trigger Guard Roll Pin
  • Trigger Pin
  • Trigger Spring

Easy-to-Follow Install Instructions

First time assembling, or need assistance with certain steps? Check out our in-depth instructional and picture guide. It shows the full LPK assembly with tips and tricks, including tools required and the buffer tube and castle nut install.

Want a video instead? We've got a very detailed instructional video that shows you how to install your LPK, too! 

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.