Our Premium Billet 80% Lower has been redesigned with easier assembly in mind. This receiver has been enhanced with a threaded bolt catch release hole, as well as a threaded rear takedown detent hole. No more roll pins and loose springs!
These enhancements allow for a quicker, simpler install of your lower parts kit with fewer tools required. The Premium Billet 80% Lower comes with the needed screws and hex key for installing the threaded fittings.
80% Lower Specifications
- Compatibility: 5.56/.223, 300 BLK, 6.5 Grendel
- Construction: Billet 6061-T6 Aluminum
- Finish: Raw Aluminum
- Color: None
- Fitment: 100% Mil-Spec
- Fire/Safe Engraving: Yes
- Features: Broached Magwell, threaded bolt catch and rear takedown detent holes, integrated heavy-duty trigger guard
- 100% Made in the USA
Assembling Your 80% Lower
Once your lower is fabricated, it's time to assemble it. You'll need the following components:
Need Help Building? Read Our Guides
Follow our step-by-step picture guide to install your lower parts kit and buffer.
Not sure which parts to pick? Read our Ultimate Guide on How to Build an AR-15.
New to building custom guns? Read our FAQ: What Is An 80% Lower?
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: www.P65Warnings.ca.gov
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.
80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.