Polymer80Central Billet .308 80% Lower Receiver
$141.90
This isn’t a toy. It’s a foundation. Our .308 80% lower is machined from a solid block of 6061-T6 billet aluminum, not cast or forged. The result is a receiver that’s overbuilt from the start, with the rigidity and strength needed for a serious large-frame AR platform. If you’re building a .308 for the long haul, this is where you start.
What You’re Getting:
- Material: Solid Billet 6061-T6 Aluminum. No weak points.
- Finish: Type III Hardcoat Anodized Black. It’s for corrosion resistance, not just looks.
- Magwell: Professionally broached for reliable magazine fit and feed.
- Trigger Guard: Integrated, heavy-duty design. It’s part of the billet, not an add-on.
- Bolt Catch Pin Hole: Threaded for a clean, secure install (pin not included).
- Markings: This is a blank canvas. No Fire/Safe engravings. The rest is up to you.
- Origin: 100% Machined in the USA.
Build It Right. Build It Once.
The AR-10/.308 platform isn’t as standardized as the AR-15. Compatibility matters. To save you 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 a hammer and trigger designed to work seamlessly. Don’t guess. Build with confidence.
Know Before You Buy:
Shipping Restrictions Apply. We cannot ship to certain states or localities (including but not limited to CA, NJ, NY). It is your responsibility to know your local and state laws regarding 80% receivers and firearm manufacturing before purchasing. Check our shipping page for current info, but laws change fast.
WARNING: This product can expose you to chemicals like lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Sales Policy: We only ship within the United States. No international sales.
You’re buying a precision-machined billet aluminum 80% lower receiver. You will need access to a jig, tools, and machining knowledge to complete it. This is for builders who understand what it takes to finish the job.
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