80% Lower Fire/Safe Marked - Raw - polymer 80
Pros & cons
What works
- Weighs 5.5 oz — matches Mil-Spec aluminum lower weight standards
- Raw surface at 63 Ra roughness — superior for coating adhesion versus pre-finished lowers
- Saves $35-50 in surface preparation costs compared to stripping anodized finishes
Trade-offs
- Requires immediate protective coating after machining — raw aluminum oxidizes within 48 hours in humid environments
- No jig included — adds $89-150 for proper milling fixture
- Fire control pocket requires precise 0.86-inch depth milling — beginner errors can ruin receiver
Video review
Expert review
Specs at a glance
About this product
What is the 80% Lower Fire/Safe Marked - Raw? This is an uncoated forged aluminum 80% lower receiver with factory-engraved fire/safe markings designed for custom AR-15 builds. It arrives at 80% completion status, requiring milling and drilling to become a functional firearm component. The raw finish provides a blank canvas for custom anodizing or Cerakote applications.
What is the 80% Lower Fire/Safe Marked - Raw used for?
This lower is used for building custom AR-15 rifles from an 80% completion state. It requires approximately 2-3 hours of machining with a jig and drill press to complete the fire control pocket and pin holes. The raw aluminum surface accepts custom finishes better than pre-anodized versions, making it ideal for specialized coatings or color matching.
How does the 80% Lower Fire/Safe Marked - Raw compare to the 80% Lower Fire/Safe Marked - Anodized Black?
The raw version provides superior coating adhesion compared to the pre-anodized model, with surface roughness measuring 63 Ra versus the anodized version's polished 32 Ra finish. The anodized black version offers immediate corrosion protection but limits finish options, while this raw unit requires immediate protective coating after machining but accepts custom finishes more effectively.
What does it weigh and what are the dimensions?
The lower weighs 5.5 ounces (156 grams) and measures 7.25 inches long, 2.12 inches wide, and 1.62 inches tall at the buffer tube extension. The fire control pocket requires milling to a depth of 0.86 inches with standard AR-15 jig fixtures. These dimensions match Mil-Spec AR-15 lower receiver standards within 0.005-inch tolerance.
Who is this NOT for?
This product is not for beginners without access to milling equipment or those seeking a ready-to-use lower receiver. It requires a drill press, end mills, and specific drill bits for proper completion. Users in states with restrictive 80% laws should verify local compliance before purchase, as serialization may be required.
What's in the box?
The package contains one raw 80% lower receiver with pre-engraved fire/safe markings, protective foam packaging, and a small bag of desiccant. No jig, drill bits, or completion tools are included—these must be sourced separately, such as from our jig kit bundle. The receiver arrives clean and degreased for immediate machining.
Is the 80% Lower Fire/Safe Marked - Raw worth it at $44.99?
At $44.99, this represents a 22% savings over the anodized version while providing better surface preparation for custom finishes. For builders planning specialized coatings or color matching, the raw finish eliminates the need for abrasive blasting to remove existing anodizing, saving approximately $35-50 in preparation costs compared to stripping a finished lower.
Key attributes
| Completion | 80% |
| Material | Forged 6061 aluminum |
| Finish | Uncoated raw |
| Weight | 5.5 oz |
| Markings | Fire/Safe engraved |
| Compatibility | Mil-Spec AR-15 |
| Tolerance | +/- 0.005 inch |
| Package Contents | 1 lower receiver |
Specifications
| completion | 80% |
| material | Forged billet aluminum |
| finish | Uncoated raw |
| marking | Fire/Safe marked |
| weight | Approximately 5.5 oz |
Materials
- Forged billet aluminum
What's in the box
- One 80% lower receiver
Frequently asked questions
- Is it compatible with standard AR-15 parts kits?
- Yes, it accepts all Mil-Spec AR-15 components including trigger groups, pistol grips, and buffer tubes. The fire control pocket requires milling to precisely 0.86-inch depth to accommodate standard AR-15 triggers. Use a quality jig like the Polymer80 Jig System for proper alignment.
- Does it fit standard AR-15 jigs?
- Yes, it works with most commercial 80% lower jigs including Polymer80 and 5D Tactical jig systems. The indexing points are standardized at 0.25-inch spacing. Allow 2-3 hours machining time with proper carbide end mills for clean results.
- How long does shipping take?
- Standard shipping within the continental US takes 3-5 business days via FedEx Ground. Express options are available for 2-day delivery at additional cost. All shipments require adult signature confirmation upon delivery per ATF regulations.
- Can I return it if I mess up the machining?
- No, returns are not accepted once machining has begun due to ATF regulations regarding altered receivers. We recommend practicing on aluminum scrap first—approximately 30 minutes of practice milling can prevent costly errors. Review our machining guide before starting.
- Does this work with aftermarket triggers?
- Yes, it accepts drop-in trigger systems like Timney and CMC triggers once properly milled. The fire control pocket must be milled to precisely 1.34-inch width to accommodate most aftermarket units. Measure twice before final cutting.