(15 customer reviews)


Upgrade your AR-15 with our 80% Forged Lower Receiver Black Anodized. Made in the USA from 7075-T6 aluminum, this lower offers customization, durability, and compatibility with various calibers. Start your build today!


Product Overview

Our 80% Forged Lower Receiver Black Anodized will upgrade your AR-15. This AR-15 80% LOWER – FORGED 7075-T6, which is made in the USA from 7075-T6 aluminum, is adaptable, strong, and compatible with a range of calibers. Start building your AR-15 80% LOWER – FORGED 7075-T6 right away!
Have you had the urge to construct an AR-15? So this is your cue that the moment is now. The Modulus Arms AR15 80 lower‘s sleek design offers close tolerances for a build that can be great for almost anything, whether the intended use is for home defense, competitive shooting competitions, or even if you just use it to train new shooters.

Product Details

  • Manufacturer: Cardinal
  • Part Number: 8004
  • Part Weight: 12oz
  • Production Date: 10/2022
  • Country of Origin: USA
  • 0-80% Machining: Precision CNC, Accepts All Mil-Spec Parts
  • Material: 7075 T-6 Aircraft-Grade Aluminum Forging
  • Coating: MIL-A-8625 Type III Class 2 Hardcoat Anodized
  • Finish: Bead-Blasted Mil-spec Black
  • Safety Selector Engravings: Yes
  • Pre-milling: Rear Shelf Included
  • Trigger Guard: Open
  • Magazine Well Finish: Broached


Our 80% lower receivers are the best 80% lowers available in terms of both quality and price. They are the only 80% lowers that are protected against any kind of *accidental damage by a lifetime guarantee and lifetime replacement warranty.

Excludes intentional harm and damage resulting from improperly machining the 80 lower.


What advantages come with the 80% Black Anodized AR-15 Forged Lower Receiver?

This lower receiver gives you:

freedom to personalize
Quality and longevity
compatibility with a range of munitions
smooth appearance

2. Is it legal for me to construct my AR-15 with an 80% lower?

Yes, provided you adhere to all applicable local, state, and federal regulations regarding the manufacture and ownership of firearms.

3. Do I need special equipment to lower this by 80%?

Drill presses, end mill bits, and jigs for precision machining are a few necessary tools.

4. Can all upper receivers for the AR-15 80% LOWER – FORGED 7075-T6 be used with this lower?

Yes, all Mil-Spec upper receivers will fit it.

5. Is an 80% lower possible for a novice?

A novice can successfully complete an 80% lower with the correct resources and direction.

Shipping Restrictions:

This item is restricted from shipping to ex-USA, US Territories, APO/FPOs, California, Connecticut, Delaware, District of Columbia, Hawaii, Illinois, New Jersey, New York, Rhode Island, Washington State, Boulder County CO, Denver CO and freight-forwarding companies. Orders with shipping and/ or billing addresses at these locations will be cancelled.

Also, as a precondition of sale, buyer agrees to release seller from all liability. Whether criminal or civil, arising from the purchase, ownership, possession, use or misuse of this item. By purchasing this item, you warrant you are US Citizen and that you are legally allowed to purchase and possess this item.

15 reviews for AR-15 80% LOWER – FORGED 7075-T6 – BLACK ANODIZED

  1. Jerald C.

    Jig , router, directions, results Jig , router, directions, results all A1. Very easy for anyone with basic ability to follow directions and take your time. First one took approximately 6 hrs from opening box to testing weapon. And that included setting up jig and router. I highly recommend this kit and the billets for quality and ease of use.

  2. William S.

    Beautiful material with a great Beautiful material with a great finish.

  3. Robert G.

    Billet lower Very good quality billet 80% lower. The fit and finish was excellent. No problems attaching it to my billet upper. It should function well. The website was clean with good inventory.

  4. David G.

    Great lowers, it is messed up that they are attempting to make these illegal. I have used these for several builds and I hope they will continue to be available.

  5. Andrew R.

    Good price. Fast shipping. Arrived Good price. Fast shipping. Arrived faster than i had expected. I ordered another list from a different company and this one has better tighter tolerance. The build material and quality is very good for what you get. I like the look of it. Nice lower.

  6. Kyle M.

    I ordered an 80% lower. I ordered an 80% lower. Works great. Had it in less then a week. Very happy.

  7. Jason Y.

    Beefy in the right way. Very nice. Solid and happy to say it is ‘beefier’ than your standard lower. Fits fantastic with my side charging upper. It is more matte than most. I like it.

  8. Thomas H.

    Excellent product! Awesome package! Arrived early, great packaging, highly recommend

  9. Gregory W.

    Worked out well. Turned into a beautiful pistol. I’ve named her Faafo. Paired it with a Durkin Tactical build kit and it was an easy build. But beware if you decide to do one in .308. Do your due diligence on kit compatibility with uppers and lowers is the best advice I can share.

  10. Stephen B.

    Good quality, well-machined and anodized, without pits or voids, machines easily, and fits my bison armory upper quite well.

  11. Kevin C.

    I have an easy jig gen 2 and the process to mill the lower is very easy if you just take your time. The key to a good final product is following the instructions and milling very little material at a time.

  12. Thomas E

    Best lower hands down Great looking lower. A little beefier than any serialized lowers I’ve bought. Lines up and looks great with the side charger I put on it. Was very easy to mill out! I also love that the bolt catch retaining pin is the screw in type. Fantastic. Easily my favorite lower that I own. Just need to find a better grip to put on it. Lol.

  13. Timothy D.

    First time This was my first build, but hopefully won’t be my last. Using the jig, and reading through the instructions, led me through the process without any issues. Took me about 30 minutes to complete the milling. Since then, I’ve cut more lowers. Next one is a 9mm and maybe a .308 soon after.

  14. Jose A.

    Looks great material is good Looks great material is good it’s my 4th one I got

  15. Thomas C.

    Looks great works great can’t, can’t beat it

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