Description
The Franklin Armory Stripped Lower, Binary Mode Engraving, Multi-Cal, Black Hardcoat Anodized is a mil-spec AR-15 lower receiver. It’s the serialized foundation for building a custom rifle or pistol, pre-marked for compatibility with Franklin Armory’s binary trigger systems and designed to handle multiple calibers from .223/5.56 to 9mm with the right parts kit. This stripped lower ships to Missouri and compliant US states, requiring an FFL transfer for firearm purchases.
Key Features
- Binary Mode Engraving: Factory-marked selector positions for safe, semi, and binary fire, signaling readiness for an enhanced trigger system.
- Multi-Caliber Platform: Build into a 5.56 NATO rifle, a 300 Blackout pistol, or a 9mm PCC—this lower is your starting point.
- Durable Finish: Black hardcoat anodizing provides a tough, corrosion-resistant surface that stands up to hard use and the elements.
- Mil-Spec Compatibility: Fits out of the box with the vast ecosystem of AR-15 parts, from standard lower parts kits to popular stocks and grips.
Specifications & Details
| Specification | Detail |
|---|---|
| Material | 7075-T6 Aluminum |
| Finish | Black Hardcoat Anodized |
| Caliber Compatibility | Multi (Accepts .223/5.56, .300 BLK, 9mm, etc. with appropriate parts) |
| Fire Selector Markings | Safe, Semi, Binary |
| Trigger Compatibility | Standard AR-15 / Mil-Spec (Designed for Franklin Armory Binary Triggers) |
| Magazine Compatibility | Standard AR-15 magwell (Adapter required for 9mm Glock or Colt-style magazines) |
When it comes to building a rifle for dynamic training or a dedicated home defense tool, the foundation is everything. This lower gives you that solid, trusted base. Its binary-ready engraving isn’t just cosmetic—it’s a built-in roadmap for a future upgrade that changes how you interact with your firearm. The multi-caliber design offers serious flexibility; maybe you start with a lightweight 5.56 build but later decide you want a compact 9mm pistol-caliber carbine for faster follow-up shots. That said, you’re not locked into one vision. At $97.28, this receiver represents a smart entry point into a custom build without compromising on core quality. The hardcoat anodizing is a professional-grade finish you’d expect on completes costing much more, providing essential protection against wear and moisture. It’s a component that demands you think about what you want your final firearm to do. Are you building a precision rifle, a close-quarters tool, or a versatile multi-role platform? This lower can be the start of any of them.
Who This Lower Is For
This stripped lower is for the builder who values future capability. It’s ideal for someone planning to install a Franklin Armory BFSIII binary trigger down the line, saving the cost and hassle of custom engraving. It’s also perfect for first-time builders who want a flexible platform to learn on, or experienced shooters creating a dedicated host for a specific caliber upper, like a .300 Blackout from Aero Precision or a 9mm upper from CMMG. You get a proven, mil-spec foundation with a clear path for enhancement.
Pros & Cons
Pros: The pre-engraved binary markings are a major value-add for trigger upgrade plans. Multi-caliber capability offers long-term build versatility. The mil-spec design guarantees broad parts compatibility. The hardcoat finish is durable for a component at this price point.
Cons: As a stripped lower, it requires additional parts and tools to become a functional firearm. The binary trigger itself is a separate, regulated purchase. First-time builders must be prepared for the assembly process and associated costs beyond the receiver.
Frequently Asked Questions
Q: Does this come with a binary trigger installed?
A: No. This is a stripped lower receiver only. The “Binary Mode Engraving” refers to the selector markings milled into the receiver, indicating it is designed to properly function with a Franklin Armory binary trigger system, which must be purchased and installed separately.
Q: What parts do I need to complete this into a working lower?
A: You will need a lower parts kit (LPK), which includes the trigger, hammer, safety selector, pins, and springs; a buffer tube kit (buffer tube, spring, buffer, and end plate); a stock; and a pistol grip. A compatible magazine is also required for the caliber you choose to build in.
Q: Is this lower compatible with both rifle and pistol-caliber uppers?
A: Yes, its standard AR-15 magwell and mil-spec design make it compatible with rifle-caliber uppers (like 5.56) and, with the use of a dedicated magazine block or adapter, pistol-caliber uppers (like 9mm using Glock or Colt-style mags). Always ensure your upper, bolt carrier group, and magazine components are matched to your chosen caliber.
Start your next build on a versatile, future-ready foundation. This Franklin Armory lower is available at firearms-missouri.com for Missouri residents and nationwide.
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