The Franklin Armory FAI-15 stripped lower receiver is a precision-machined foundation for building a custom AR-platform rifle. Designed as a multi-caliber lower, it provides broad compatibility with a wide range of upper receivers and configurations, allowing for flexible builds tailored to specific shooting needs. Constructed for strength and durability, the receiver delivers a solid base for reliable long-term performance. Engineered to accept standard AR-15 components, the FAI-15 supports a wide selection of triggers, grips, and other aftermarket parts, making it highly adaptable for customization. Its clean, stripped configuration allows builders to select and install preferred components, creating a personalized setup suited for everything from range use to defensive applications.