Product Overview and Introduction

Take your tactical rifle’s speed, versatility, and ergonomics to the next level with the Franklin Armory BFSIII AR-S1 Binary Trigger featuring a match-grade Straight Bow and a durable Black Finish – MPN: 00-50621-BLK. Combining the revolutionary performance of the BFSIII (Binary Firing System III) with a modern flat trigger face, this system completely transforms how your AR platform shoots by allowing you to discharge rounds on both the pull and the release of the trigger.

Whether you are looking to dominate local competition stages, maximize your range enjoyment, or enhance your tactical training efficiency, this 3-position drop-in trigger delivers lightning-fast split times, enhanced leverage, and unmatched semi-automatic versatility.

Revolutionary 3-Position Safety Selector & Straight Bow Ergonomics

The BFSIII AR-S1 gives the shooter absolute control over their rate of fire and finger placement through an advanced design:

• Safe Position: The firearm will not fire.

• Semi-Automatic Position: Functions as a traditional, crisp semi-automatic trigger with a clean break and positive reset.

• Binary Position: The firearm discharges one round on the pull of the trigger AND one round on the release of the trigger.

• Easy Cancellation: If you enter Binary mode and decide not to fire the release round, you can safely cancel it by simply holding the trigger down while rotating the selector lever back to Semi or Safe.

• Flat Straight Bow Design: Provides a consistent finger placement surface, allowing for a straight-back pull and enhanced leverage for a lighter perceived pull weight.

Premium Engineering and Universal Fit

Designed to fit standard small-pin AR-15, AR-10, and .308 platform lower receivers, Franklin Armory builds every BFSIII unit to strict military and commercial tolerances using high-grade ordnance steel and precision machining. It provides a smooth, predictable pull while maintaining the structural integrity required for heavy-use environments.

Key Features and Benefits

• Dual-Action Speed: Fires on both trigger pull and trigger release to drastically increase your effective rate of fire.

• Straight Flat Bow: Offers improved leverage and consistent finger placement for rapid-fire strings.

• 3-Position Versatility: Seamlessly switch between Safe, Semi-Auto, and Binary modes.

• Standard Platform Compatibility: Drops into standard small-pin (.154-inch) AR-15 and AR-10 lower receivers.

Specifications

• Product Type: 3-Position Binary Trigger Assembly with Straight Bow

• Manufacturer Part Number (MPN): 00-50621-BLK

• Platform Compatibility: AR-15 / AR-10 / .308 Lower Receivers (Small Pin .154-inch)

• Trigger Style: Straight / Flat Bow

• Trigger Modes: Safe / Semi-Automatic / Binary (Pull & Release)

• Finish: Black

• Manufacturer: Franklin Armory