Polymer80Deals.com Exclusive: Billet .308 80% Lower Receiver

Build a serious .308 platform on a foundation that won’t quit. This isn’t a flimsy casting. It’s a solid block of 6061-T6 billet aluminum, precision-machined into one of the most robust 80% lowers you can get for your LR-308/AR-10 project. The anodized black finish isn’t for show—it’s a hard layer of protection against the elements, ensuring your build stays looking sharp.

We machine these right here in the USA with features a builder will appreciate. The magwell is professionally broached for smooth, reliable magazine changes. The trigger guard is integrated and heavy-duty, so you won’t snap it off in the field. And yes, the bolt catch pin hole is threaded, making that part of the assembly straightforward (pin not included).

Important Note: This lower is not fire/safe marked. It is your responsibility to understand and comply with all federal, state, and local laws regarding the manufacture and marking of firearms before purchasing or machining.

Specifications & Details

• Platform: .308 / LR-308 / AR-10
• Material: Billet 6061-T6 Aluminum
• Finish: Type III Hardcoat Anodized Black
• Features: Broached Magwell, Integrated Heavy-Duty Trigger Guard, Threaded Bolt Catch Hole
• Fire/Safe Markings: No
• Origin: 100% Made in the USA

Build It Right: Our Recommendation

The .308 platform is known for parts compatibility quirks. To save you headaches and ensure a smooth fit, we strongly recommend pairing this billet lower with our dedicated LR-308 Lower Parts Kit. It includes the specific threaded bolt catch pin this lower needs, plus a quality hammer and trigger designed for the platform. Get the right parts the first time.

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