The Franklin Armory BFSIII Elite Salus Lower SBM4 Multi-Caliber brings the innovative Binary Firing System to a dedicated lower receiver package. Built around Franklin Armory’s BFSIII trigger, this semi-automatic lower is configured to accept multiple calibers, giving shooters a flexible foundation for a variety of AR-style builds while maintaining reliable performance and consistent trigger control.

This lower is ideal for enthusiasts who want a configurable platform for range use, training, or recreational shooting without being locked into a single caliber. Paired with the right upper, it can be tailored for everything from casual target practice to more focused skill development. Franklin Armory’s reputation for thoughtful engineering and dependable components makes the BFSIII Elite Salus Lower SBM4 a solid choice for building out a versatile AR system.

• Manufacturer: Franklin Armory
• Model: BFSIII Elite Salus Lower SBM4
• Caliber/Gauge: Multi-Cal
• Action: Semi-Automatic
• Length: 20.25 inches