80% Arms 9mm AR-9 80% lower receivers are machined to the highest quality standards using the most advanced CNC machines in the world. The machines we use are designed to manufacture spacecraft and aerospace parts which require extremely tight tolerances. The end result is the best quality 80% lower receiver on the market.
- Fully billet design
- Accepts Glock magazines
- Fire Safe / Safe markings engraved
- Threaded bolt catch hole
- Threaded hole for upper receiver tension adjustment
- Mil-spec part compatibility ensures maximum rifle customization
- Withstands the harshest punishment from any situation using ultra-tough design, precision machined from aircraft-grade billet aluminum for superior strength.
- Flared mag well aids with faster, easier magazine reloads
- Heavy-duty, integral trigger guard enables winter use with gloves
- Rear takedown lug pocket completed
Lifetime warranty against manufacturing defects guarantees impeccable quality. We can ship to your door because 80% lowers are not considered firearms by the ATF. No FFL required. Feel the rewarding satisfaction of creating your own lower receiver - secure yours today.
*Requires 9mm upper and 9mm bolt carrier group. Includes magazine release.
**Our 80% AR-9 lower receivers are designed to work with the "last round bolt hold open" feature in the upper receiver. The last round bolt hold open (LRBHO) is the function that keeps the bolt carrier group locked rearward on an empty magazine after the last round has been fired. For proper LRBHO function, please make sure to buy the appropriate upper receiver.