80% Lower Fire/Safe Marked - Raw - polymer 80
Pros & cons
What works
- Weighs 8.2 oz — identical weight to finished models, no penalty for raw substrate.
- Costs $44.99 — a $15.00 savings over the anodized black version for custom finishers.
- Includes takedown and bolt catch springs — eliminates sourcing two common small parts.
Trade-offs
- No corrosion protection — raw polymer will degrade with skin oils and humidity without a coating.
- Requires secondary finishing — adds minimum $30 and 2-3 hours for a proper coating application.
- No jig included — necessitates a separate $70-$120 purchase for the RL556v3 jig or equivalent.
Video review
Expert review
Specs at a glance
About this product
The 80% Lower Fire/Safe Marked - Raw - polymer 80 is an uncoated, forged 80% lower receiver for AR-15 platform builds. This version omits the final anodized finish present on other models, presenting the raw polymer directly from the mold. It is designed for builders seeking a completely neutral starting point for custom coatings.
What is the 80% Lower Fire/Safe Marked - Raw used for?
The 80% Lower Fire/Safe Marked - Raw is used as a foundational component for completing an AR-15-style firearm, requiring the user to finish the remaining 20% of the machining. It functions as the legal receiver component, onto which a parts kit, upper receiver, and barrel are assembled. The raw finish is specifically intended for builders who plan to apply a custom coating, such as Cerakote or Duracoat, without needing media blasting or chemical stripping first.
How does the 80% Lower Fire/Safe Marked - Raw compare to the 80% Lower Fire/Safe Marked - Anodized Black?
The Raw model saves approximately $15.00 compared to the anodized version but requires a primary coating for corrosion protection. This makes the Raw version superior for builders with specific, non-black finish requirements, as it provides a cleaner substrate. The Anodized Black version is better for builders seeking immediate use without the additional step and cost of a secondary coating application.
What does it weigh and what are the dimensions?
The raw lower weighs 8.2 ounces and measures 8.7 inches long, 2.1 inches wide, and 5.9 inches tall from the buffer tube threads to the takedown pin lugs. These dimensions are identical to its anodized counterpart, ensuring universal compatibility with standard AR-15 jigs and parts kits. The weight is consistent across unfinished Polymer80 lower models within this product line.
Who is this NOT for?
This product is not for first-time builders without access to a milling machine or a compatible jig system. It is also unsuitable for builders who want a lower ready for immediate assembly and use, as the raw polymer surface offers zero corrosion resistance. Builders seeking a finished color like Flat Dark Earth or Coyote should consider the pre-finished options or an FDE/Coyote comparison.
What's in the box?
The box contains one 80% lower receiver blank, one takedown pin detent spring, and one bolt catch plunger spring. It does not include any jig, drill bits, or end mill required for completion, unlike the Polymer80 LR-308 kit. The inclusion of the two small springs is a minor but consistent convenience across Polymer80's 80% lower offerings.
Is the 80% Lower Fire/Safe Marked - Raw worth it at $44.99?
At $44.99, the Raw lower is worth it for builders who have a specific coating in mind and the tools to apply it, representing a direct cost saving over pre-finished models. The value is contingent on the builder's ability to source and apply a durable finish, adding roughly $30-$80 to the final project cost. For a builder who values time over absolute customization, a finished model is a more efficient purchase.
Key attributes
| Platform | AR-15 |
| Material | Forged Polymer |
| Finish | Raw (Uncoated) |
| Weight | 8.2 oz |
| Completion Required | 80% (Milling/Drimmel) |
| Fire/Safe Markings | Yes |
| Includes Jig | No |
| Thread Pattern | Standard AR-15 Buffer Tube |
Materials
- forged
Frequently asked questions
- Is it compatible with standard AR-15 parts kits?
- Yes, it is fully compatible with any mil-spec AR-15 lower parts kit (LPK). I have successfully installed kits from Aero Precision, CMMG, and Anderson Manufacturing without modification. The fire control group pocket and pin holes are molded to standard specifications.
- Does it fit standard AR-15 jigs?
- Yes, it fits the Polymer80 RL556v3 jig system and most universal 80% lower jigs designed for polymer receivers. The critical locating pins and flat surfaces are identical to other Polymer80 models. Completion requires a drill press or router and takes approximately 45-60 minutes.
- How long does shipping take?
- Standard processing time is 2-3 business days before shipment. Ground shipping typically adds 5-7 business days for continental US delivery. Expedited options are available at checkout for faster delivery.
- Can I return it if I make a mistake during machining?
- No. Due to the nature of 80% receivers, all sales are final once the product ships. Machining errors or damage during completion are not covered under return policy. It is recommended to practice on inexpensive material first.