out of stock

AR 308 80% Lower Receiver - Billet - Black Anodized


Out of stock

Crafted for precision, our Gen 1 Style DPMS lower receiver is built from solid billet 6061-T6 aluminum and CNC machined to exact standards. Ideal for those seeking a reliable foundation for their build, this receiver integrates smoothly with any DPMS Gen 1 pattern upper receiver, such as those by Aero Precision or CMMG. However, it's not compatible with KAC or PSA patterns.

Key Features:

  • DPMS Gen 1 Compatibility: Ensuring seamless integration with various upper receivers.
  • Broached Magazine Well: For smoother mag insertion.
  • Oversized Integrated Trigger Guard: Enhancing ergonomics and safety.
  • FIRE/SAFE Safety Selector Engraving: Clear and durable markings.
  • Flared Magazine Well: Makes magazine changes swift and effortless.
  • Accepts Threaded Bolt Catch Pin: For easier assembly.
  • MIL-A-8625 Type III Class 2 Black Hardcoat Anodized Finish: Ensuring lasting protection against wear and tear.

Please be informed, the required threaded bolt catch screw for our .308 lowers is not included with this unit but can typically be found in DPMS Gen 1 308 Lower Parts kits, like the one we offer.


 In the firearm landscape, the 80% lower has emerged as a powerful representation of self-reliance, customization, and practical know-how. Here's a look at why you should consider building your own, especially in today's times: 

  • Full Control: When you build from an 80% lower, you're in the driver's seat. Every part, every detail, is under your command, ensuring you get exactly what you want.
  • Mechanical Insight: Get to know your firearm inside and out. Building from the ground up deepens your understanding of its mechanics, which can be crucial in critical situations.
  • Tailored Customization: Why settle? Constructing your own allows for unique modifications suited precisely to your preferences.
  • Regulation and Privacy: One of the compelling reasons many choose to complete an 80% lower is the privacy it offers. Since 80% lowers are not considered firearms until they're completed, they don't require an FFL (Federal Firearms License), provided all federal and local laws are adhered to.
  • Skill Acquisition: It's a straightforward task with an 80% lower, but the skills you pick up—precision drilling, milling, and finishing—can be applied elsewhere.
  • Be Ahead of the Curve: With shifting regulations and market uncertainties, there's no telling where the future of firearms is headed. Secure your capability to build and customize by diving into 80% lowers now.

Simply put, if you've ever considered building your own firearm, there's no better time than the present. Equip yourself with the skills and knowledge, and ensure you aren't left wishing you'd acted sooner.


Modulus Arms is your premier destination for high-quality 80% billet lowers for your AR-15. Our comprehensive range caters to varied styles and finishes, ensuring you find the perfect piece for your project. Connect with our team for more details today.

Commitment to Quality: We pride ourselves on producing original, premium equipment, allowing firearm enthusiasts to complete their projects at home. Several enhancements have been made to the traditional Mil-Spec design, introducing a fresh and unique approach to the 80% lower concept. Rest assured, every product from Modulus Arms comes with a lifetime warranty, enabling you to craft with confidence.

Shipping Restrictions
We cannot ship this product to any states or cities that have passed laws restricting these items such as California, Connecticut, New Jersey, New York, Washington D.C, Washington, Hawaii, Colorado, City of Philadelphia Pennsylvania, Maryland, Illinois, Oregon, and Rhode Island