Binary Firearms Systems M4-BLR Lower with SBM4 Brace

Binary Firearms Systems M4-BLR Lower Receiver

This is a complete AR-15 lower receiver assembly built around the Binary Firearms Systems binary trigger mechanism—a system that fires once on the trigger press and once on the release, effectively doubling your rate of fire within the legal framework of semi-automatic operation.

Key Features

• Binary Trigger System: Fires on both trigger press and release, providing two rounds per trigger cycle
• SBM4 Stabilizing Brace: Integrated brace designed for one-handed operation and improved control
• M4-BLR Configuration: Purpose-built for modern sporting rifle applications
• Drop-in Ready: Fully assembled and ready to accept your upper receiver

What You Get

This lower receiver comes as a complete assembly, eliminating the need for additional trigger group components or installation. The binary trigger system is legal in most jurisdictions for civilian use, though you should verify local regulations before purchase.

Performance Characteristics

The binary trigger delivers a unique shooting experience. The trigger pull is crisp and predictable, with a clean break on the press and a positive reset. The SBM4 brace provides a stable platform for accurate shooting and helps manage recoil impulse.

Ideal For

Competitive shooters, sport shooters, and those seeking a modern alternative to traditional semi-automatic triggers. The system rewards trigger control and offers a distinctive shooting experience that many find both practical and engaging.