FN M249S Trigger Mechanism


This trigger mechanism includes:
  • Safety
  • Sear
  • Sear Pin
  • Trigger Mechanism Retaining Spring
  • Pistol Grip
  • Trigger Guard
  • Trigger Assembly
  • Trigger Pin
  • Trigger Spring
  • Trigger Module Pin
  • Front Trigger Guard Pin

Manufacturer: FN America

  • Brand:FN America
  • Caliber: .223 Rem,5.56x45mm
  • Finish / Color: Black
  • Firearm Type: Rifle
  • Material: Steel
  • Models Fit: FN M249S

Enhancing the M249 SAW with a Binary Trigger: A Game Changer for Firepower

The M249 Squad Automatic Weapon (SAW) is renowned for its robust performance in both military operations and civilian sports shooting. The introduction of the M249 SAW binary trigger has opened up new possibilities for enhancing this already formidable weapon. This guide delves deep into the binary trigger system, offering insights into its design, benefits, and also legal considerations.


The M249 SAW, a staple in combat scenarios, is known for its reliability and high rate of fire. Integrating a binary trigger into the M249 SAW enhances its functionality, allowing for rapid firing capabilities that mimic automatic firing without the legal encumbrances. This introduction to the M249_SAW binary trigger explains what a binary trigger is, how it differs from standard triggers, and why it might be a significant upgrade for your M249.

Design and Features of the M249 SAW Binary Trigger

The M249 SAW binary trigger is a sophisticated piece of engineering designed to enhance the shooting capabilities of the M249 SAW. Here’s a closer look at its design and features:

  • Trigger Mechanism: Unlike standard triggers, the binary trigger allows for shooting on both the pull and release of the trigger, effectively doubling the rate of fire.
  • Safety Features: It includes multiple safety mechanisms to prevent accidental discharges and ensure safe operation.

These features make the binary trigger an exceptional upgrade for the M249 SAW, providing a blend of safety, efficiency, and performance.

Enhancing Performance with the Binary Trigger

The primary advantage of upgrading the M249 SAW with a binary trigger is the significant enhancement in firing rate and control. Here are some benefits detailed:

  1. Increased Firing Rate: With the ability to fire rounds on both the pull and release, the firing rate nearly doubles without compromising the legal status of the firearm.
  2. Improved Control: Despite the increased rate of fire, the binary trigger allows for more controlled bursts and better overall handling of the weapon.

These enhancements are beneficial not only for competitive shooters looking to improve their performance but also for tactical operators who might need rapid firing capability under combat conditions.

Installation Guide for the M249 SAW Binary Trigger

Installing a binary trigger in an M249 SAW is a detailed process that should ideally be handled by professional gunsmiths. Here’s a simplified overview:

  1. Disassembly: Begin by safely unloading the firearm and disassembling it according to the manufacturer’s instructions.
  2. Trigger Assembly Replacement: Replace the standard trigger assembly with the binary trigger, ensuring all components are correctly aligned and secured.
  3. Function Testing: Once installed, perform a comprehensive function test to ensure the trigger operates smoothly and safely.

For detailed installation guides and tutorials, visiting Rare Breed Trigger Co. can provide additional resources and also specific product links.

The use of binary triggers falls under specific legal frameworks, which vary by country and state. In the United States, binary triggers are generally legal but subject to regulations. Key points include:

  • ATF Compliance: Binary triggers are ATF approved as they do not convert a semi-automatic firearm into an automatic one.
  • State Laws: Some states have restrictions on binary triggers, so it’s crucial to consult local laws before purchasing and installing one.

Educational resources and legal advice can be found on platforms like Weeddyz, which offers insights into state-specific regulations.

User Insights and Field Performance

Feedback from users who have installed the M249_SAW binary trigger suggests significant improvements in firing capabilities and overall satisfaction. Here are some insights:

  • Positive Reviews: Many users report enhanced shooting experience and increased effectiveness in both target practice and competitive shooting scenarios.
  • Performance Issues: Some users note a learning curve in handling the increased rate of fire and recommend practice to master the new firing mode.

Discussion forums such as FN Forum and Snipers Hide provide platforms for users to share experiences and tips.

Pricing, Availability, and Value Comparison

The M249_SAW binary trigger is available through various outlets, and prices can vary based on manufacturer and specific model features. Here’s what you need to know about pricing and also availability:

  • Cost: Expect to invest in the range of $300 to $500 for a high-quality binary trigger.
  • Purchasing: Available online through retailers like Ordnance Defence and directly from manufacturers.

Comparing costs and features against other modifications can help determine the best value for your needs.


Upgrading the M249 SAW with a binary trigger can transform your shooting experience, offering a higher rate of fire and improved control without stepping into legal grey areas. Whether for competitive shooting, tactical applications, or recreational use, the M249 SAW binary trigger stands out as a valuable enhancement for any firearm enthusiast looking to upgrade their arsenal.


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