.308 80% Lower – Billet

$129.00

.308 80% Lower – Billet — 277+ sold. In stock at Polymer80Builds.

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Description

This .308 80% lower is a billet-machined foundation for a large-frame AR build. It’s for builders who want a solid, no-fuss start for a .308 Winchester or 6.5 Creedmoor rifle. The key benefit is its straightforward design and durable finish—our staff noted the coating held up through three aggressive cleaning cycles with Hoppes solvent. We added this to our catalog in late 2024 and it’s proven reliable with consistently positive feedback.

What Makes It Stand Out

  • 7075-T6 Billet Aluminum: Machined from a solid block for strength and dimensional consistency.
  • Durable Type III Hardcoat Anodizing: Provides a tough, wear-resistant finish that stands up to solvents and handling.
  • Standard .308/AR-10 Pattern: Compatible with common DPMS-pattern parts kits and jigs for a predictable build process.
  • Clean, Simple Design: No unnecessary machining or logos, giving you a blank canvas for your project.
  • Positive Fire Control Pocket: Pre-machined with clear reference surfaces to simplify your milling work.

Tech Specs

Material 7075-T6 Aluminum Billet
Finish Type III Hardcoat Anodized (Matte Black)
Caliber .308 Winchester / 7.62×51 NATO (DPMS Pattern)
Weight (measured) 7.2 oz
Fire Control Pocket 80% Complete (Requires Milling)
Thread Size 1/2-28 TPI (Pistol Grip)
Compatibility DPMS-pattern .308/AR-10 upper receivers
Packaging Anti-Corrosion VCI Bag

Common Questions

What jig do I need to finish this lower?

You’ll need a standard .308/AR-10 80% lower jig. Most common DPMS-pattern jigs on the market will work with this billet lower. Always confirm compatibility with your specific jig manufacturer.

Is this compatible with all .308 uppers?

This lower is machined to the common DPMS pattern. It is compatible with most DPMS-pattern .308/AR-10 upper receivers. It is not compatible with Armalite AR-10 pattern uppers without specific adapters.

What tools are required to finish it?

You will need a drill press or router, the correct jig, appropriate end mills for aluminum, drill bits, and standard gunsmithing tools. A vise and proper workpiece clamping are essential for safety and accuracy.

Available now. Ships within 24 hours from Medford.
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