.308 80% Lower – Billet
About this product
Polymer80 Billet .308 80% Lower Receiver – Anodized Black
$141.90
This is a serious lower for a serious rifle. Our .308 80% lower is machined from a solid block of 6061-T6 billet aluminum, not forged. That means it’s tougher, with cleaner lines and a more rigid foundation for your AR-10 or LR-308 build. The anodized black finish isn’t for looks—it’s a hard layer of protection against corrosion and wear.
We built this with the details in mind. The magwell is professionally broached for smooth, reliable magazine changes. The trigger guard is integrated and heavy-duty, so you won’t snap it with gloves on. The bolt catch hole is threaded, which makes installation cleaner and more secure (threaded pin required, included in our recommended LPK). This receiver is not marked with Fire/Safe engravings, giving you a clean slate.
Key Specs:
- Material: 6061-T6 Billet Aluminum
- Finish: Type III Hardcoat Anodized Black
- Platform: .308 / LR-308 / AR-10
- Markings: No Fire/Safe Selector Markings
- Features: Threaded Bolt Catch Hole, Broached Magwell, Integral Trigger Guard
- Origin: 100% Made in the USA
Build It Right: The .308 platform has variations. To avoid fitment headaches, we strongly recommend pairing this lower with our dedicated LR-308 Lower Parts Kit. It includes the specific threaded bolt catch pin this lower needs, plus all the correct small parts designed to work together seamlessly.
You Need to Know:
This is an 80% lower receiver. It is not a firearm and requires machining to completion. You must follow all federal, state, and local laws regarding the manufacture and possession of firearms. It is your responsibility to know the laws in your area before purchasing or proceeding. Check our shipping restrictions page for current state prohibitions. We ship only within the United States.
WARNING: Handling firearms parts can expose you to chemicals like lead, known to the State of California to cause cancer and reproductive harm. More info here.
If you’re building a durable, precision .308 rifle from the ground up, this billet lower is your starting point. No compromises.
Specs at a glance
What's in the box
- .308 80% Lower – Billet