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(30 customer reviews)

Original price was: $110.00.Current price is: $105.00.

stick with an ultra-light but capable polymer .308 lower-and-jig combo from Polymer80 and get everything you need in a single order for a great price!


After two years of planning, design, engineering, and testing, we’re proud to introduce the industry’s first reinforced polymer receiver designed for the DPMS styled .308 in an 80% format. 308 80 lower jig.

Our AR-10 jigs are designed with first-time builders in mind, so we have built-in safeguards to prevent common errors, drill bit depth guides, a manual, and tutorial videos to make the process even easier! With instructions and basic tools in hand, you can confidently complete your AR-10s lower in around one to two hours.

.308 80% Lower Receiver & Jig

Our .308 80% jigs provide you with the tools you need to complete that AR-10 clone or 700-yard bench rifle receiver. Choose the rugged Elite Builder Jig, fabricated from hardened steel with drill bushings, and confidently cut and drill your receiver for your lower parts kit, upper, and buffer system in a single afternoon.

Jig & Receiver Compatibility

These jigs last for long! One metal AR-10 jig can easily complete twenty or lowers without having to replace any plates from wear-and-tear. Want to spend as little as possible on your 80 percent lower .308 build? The polymer jig-and-lower combo kits come with both an AR-10 polymer receiver blank, the jig, and the bits!

Also, each of our stand-alone .308 jigs is made compatible with the popular DPMS LR-308 (gen 1)-type .308 80% lower receiver. These full-size receivers closely mimic the size and shape of the original ArmaLite-10 platform. Therefore, offers you the opportunity to build an accurate 7.62 NATO or .308 shooter from the ground up.

The .308 80% Lower Receiver  Design features:

  • Unique reinforced polymer design with solid core design
  • ATF compliant design
  • Beefed up buffer tube ring and ribbing across the entire upper surface area.
  • No-thread design on the pistol grip area.
  • Stiffened magwell, ultra-light design.
  • See the product page for additional parts list

Is it legal?

YES! The 308 unit is well within the defined parameters of a “receiver blank” defined by the ATF. Therefore, it has not yet reached a stage of manufacture that meets the definition of firearm frame or receiver found in the Gun Control Act of 1968 (GCA).

308 80 lower jig.

AR-308 Jig: What Comes With It?

The Polymer80 .308 jig includes all parts required for machining, including the polymer receiver blank itself! Purchasing a stand-alone jig like the Elite Builder also provides you with all components necessary to cut and drill your receiver blank:

  • (2) Side plates
  • (3) Top plate templates
  • (1) Set of HSS drill bits
  • (1) HSS end mill bit (center-cut)

Tools Required:

  • Drill press
  • Table-top vise
  • Cutting fluid

Other 308 80% LOWER RECEIVER AND JIG SYSTEM  color kits available:

While other jigs on the market require a router or milling machine, the Elite Builder’s HSS end mill bit is designed to allow you to cut the fire control cavity with plunge cuts, vertical cuts made with the end mill in a similar fashion as drilling the cavity’s pilot holes.

This is easily accomplished using a cross-slide vise that affords lateral movement.

In conclusion, with a cross-slide and press, you can complete your 308 80% LOWER RECEIVER AND JIG SYSTEM – GRAY blank within two hours.

  • Shela Skinner

    This was an easy experience, and I am completely happy with my purchase, easy of payment, and shipping time.

  • Guest

    Took a bit longer than I would have liked to get my account set up, but, outside of that. Purchase went well

  • Chicken chick

    Easy to find what I was looking for a d purchased from a seller who gave great service and item was as described. I will come back again.


    Found some hard to find parts for a project . Good prices and easy to search

  • Jerry Shean

    Easy to search and find items and bidding and checkout is fast. Seller shipped fast and I have no complaints about this service.

  • Mark McRae

    I have had many trasactions on p80gunbuyer and they have all been hassel free. Very happy with your site and how it functions

  • David Gropper

    Great communication. Wonderful experience with Gunbroker and the seller! Definitely 5 stars.

  • Hannibal kay

    I was truly impressed by the quality of my purchase and amazed how fast it came.I highly recommend this company.

  • Very happy in Texas

    This is a great place to buy guns and supplies. The sellers are sellers you can trust. It is nice to buy with confidence that everything is done with great professionalism.

  • Mark

    Good place to ‘window shop’ and do your research. I’d the best option without being in person to shop.

  • Cary

    Never had a complaint with any of the customer service, on either p80gunbuyer or who I had the transaction with. Always a great experience with no problems!

  • Michael Stickler

    As always p80gunbuyer is the superior site to purchase online. Great selection and service

  • JK Thompson

    I like all forms of .45 ACP pistols and haven’t seen the S&W 325 before. p80gunbuyer is great for finding what the local shop can’t.

  • Baron M

    Best that I have seen.

  • Frank Depp

    Best that I have seen.

  • Rosaline

    Excellent service and great time to ship the product is one of best I love it great job

  • Frank Mendez

    Looks good, Functions prperly

  • Fred C.

    Excellent quality

  • Federicko

    Have not finished 80% lower yet.

  • Rita Bryant

    It’s very satisfied and I’m getting a chance to do some unique things building Pieces of jewelry I just retired As machinist and have always wanted to do something Like this thank you

  • Valery D

    Excellent Craftsmanship

  • Harry Lynn

    i have purchased numerous lowers and have found no defects. I have also purchased the Jig and related supplies. The shipping is quick but would prefer FEDEX instead of US Mail. Where i live US Mail is not reliable. I look forward to my future builds.

  • Andrew

    Excellent Craftsmanship

  • Rita Bryant

    i have purchased numerous lowers and have found no defects. I have also purchased the Jig and related supplies. The shipping is quick but would prefer FEDEX instead of US Mail. Where i live US Mail is not reliable. I look forward to my future builds.

  • Goir LA

    Great finish & fit. Like always super fast shipping and customer service from P80

  • Paula Meyer

    I’ve built two with this lower; one in 6.5 creed and the other in .308 and both have flawless fit to the AP uppers I purchased.
    Like any build – take your time and enjoy the journey.

  • Frank Depp

    Lower matched up perfectly with upper. Great quality machining was good .

  • Rosaline

    Heavy, but strong, very nice, love it

  • Marshal Von

    Arrived on time great product great price

  • Barbara Clark

    Have not machined the lower yet or installed the parts (obviously 🙂 ) but the parts look great and shipped as fast as the current govt issues would allow. Am sure I will be more than happy with the items – unless I F them up 🙂

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