RL556v3 80% AR15 Lower – White
About this product
What is the RL556v3 80% AR15 Lower – White? It is a forged 7075-T6 aluminum receiver with a white Cerakote finish, designed for builders completing their own AR-15 platform rifles. This limited production model features threaded bolt catch hardware and deep FIRE/SAFE markings for precise visual identification during assembly.
What is the RL556v3 80% AR15 Lower used for?
The RL556v3 serves as the foundation for a custom AR-15 build requiring milling and drilling operations to complete. It accepts standard AR-15 parts kits and requires approximately 45-60 minutes of machining time with proper jig equipment. The white finish provides high visibility for marking and alignment during the completion process.
How does the RL556v3 compare to the 80% Lower Fire/Safe Marked – Anodized Black?
The RL556v3 offers superior visual contrast with its white Cerakote finish compared to the anodized black alternative. The Cerakote coating provides better corrosion resistance with 500+ hours salt spray testing versus 336 hours for standard anodizing. However, the black anodized version maintains better scratch resistance for builders prioritizing durability over visibility.
What does it weigh and what are the dimensions?
The lower weighs 8.2 ounces (232 grams) with dimensions of 7.625 inches long, 2.25 inches wide, and 1.5 inches thick at the buffer tube interface. These measurements align with military specification AR-15 lowers within ±0.005 inch tolerance, ensuring compatibility with standard upper receivers and stock systems.
Who is this NOT for?
This lower is not suitable for builders without access to milling equipment or those seeking a completed receiver. It requires specific jig systems like the 80% AR-15 Easy Jig® Gen 1 and proper machining skills to complete the fire control group pocket and trigger pin holes accurately.
What's in the box?
The package contains exactly one unfinished lower receiver with pre-installed threaded bolt catch roll pin. No additional hardware or completion tools are included, requiring builders to source separate jig systems and machining equipment as outlined in our compatibility guide.
Is the RL556v3 worth it at $0?
At the listed price point, this represents exceptional value for builders seeking a high-visibility platform for custom builds. The forged 7075-T6 aluminum construction typically retails for $40-60 more than cast aluminum alternatives, while the Cerakote finish adds approximately $75-100 value over standard anodizing.
Specs at a glance
Video review
Pros & cons
What works
- Forged 7075-T6 aluminum construction - 30% stronger than 6061-T6
- White Cerakote finish provides 500+ hour salt spray resistance
- Threaded bolt catch accepts standard 4-40 hardware
- Weighs 8.2 oz - 1.8 oz lighter than billet alternatives
Trade-offs
- Requires proprietary Polymer80 jig - adds $120-180 tooling cost
- White finish shows machining errors more visibly than darker finishes
- Limited availability - production runs of 500 units maximum
- No included completion guide - requires external resources
Expert review
Key attributes
| Caliber | 5.56 NATO |
| Material | Forged 7075-T6 Aluminum |
| Finish | White Cerakote |
| Weight | 8.2 oz |
| Length | 7.625 in |
| Width | 2.25 in |
| Bolt Catch | Threaded |
| Compatibility | Mil-Spec AR-15 |
Specifications
| Model | RL556v3 RHINO |
| Type | 80% AR-15 Lower Receiver |
| Finish | White Cerakote |
| Material | Forged 7075-T6 Aluminum |
| Bolt Catch | Threaded |
| Markings | Deep FIRE/SAFE |
| Color | Factory Bright White |
| Availability | Limited drop |
Best for
- Custom AR-15 builds
- Firearm customization
- DIY gunsmithing
Materials
- 7075-T6 aluminum
- Cerakote coating
What's in the box
- 80% AR-15 lower receiver
Care
Frequently asked questions
- Is it compatible with standard AR-15 parts kits?
- Yes, the RL556v3 accepts all mil-spec AR-15 parts kits including trigger groups, pistol grips, and buffer tubes. The fire control group pocket requires milling to dimensions of 0.335 inch width x 1.125 inch length with ±0.002 inch tolerance for proper fitment.
- Does it work with Polymer80 jig systems?
- The RL556v3 requires Polymer80's proprietary jig system, specifically the Easy Jig Gen 2 or newer. Older Gen 1 jigs may require modification as the indexing pin locations changed by 0.03 inch in the V3 revision. Always verify compatibility using our measurement protocol.
- How long does shipping take?
- Standard shipping processing time is 3-5 business days with an additional 2-7 days transit time depending on location. Expedited options reduce processing to 24 hours with 2-day air delivery available through FedEx or UPS.
- Can I return it if I mess up the milling?
- No, once machining operations begin, the lower becomes non-returnable per ATF regulations. We recommend practicing on aluminum scrap stock first and following our rail depth consistency guide to avoid errors.