top of page
FN M249S Binary Trigger Assembly

FN M249S Binary Trigger Assembly

Notice - This item is currently No Longer in Production by FN.

When a New or Replacement Model is available, this website item will be updated.

Important, Aftermarket binary triggers such a Franklin Armory will NOT work in the M249S (any style or variation).

FN M249 Trigger Mechanism.

Color, Black.


Buy M249S Binary Trigger Overview:

M249S Binary Trigger. This trigger mechanism includes major components such as the trigger frame, trigger, trigger guard, sear, safety, and pistol grip. For use on the 5.56x45mm M249 SAW, M249S, M249 PARA, and MINIMI whether manufactured by FNH, FN Herstal, FNH USA, or FN America.

This is a factory original FN part made to the same high standards as the parts already in your FN firearm. FN America factory parts and accessories are made with the same quality in materials and workmanship that you have come to expect and also trust from FN America.

This trigger mechanism includes:



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

M249S Binary Trigger Specifications:

Brand: FN America

Caliber: .223Rem, 5.56x45mm (NATO 556 Rounds)

Finish / Color: Black

Firearm Type: Rifle

Material: Aluminum,Polymer,Steel

Models Fit: M249 SAW, M249S, MINIMI

FNs Overview and Pre-Quesions about owning their Binary Trigger Assemble Mechanism -

A binary trigger increases a weapon’s firing speed. Unlike a bump stock, it is legal in most states. It allows a firearm to shoot one bullet when the trigger is pulled and one when it releases.

Are binary triggers worth it?

nope. Aslo, the trigger has to be fully pulled back for the release to fire. Let’s say the trigger breaks at 50% of the travel distance, if released right at the break it’ll fire one shot only. The awkward pumping of the trigger takes some getting used to and still isn’t very accurate.

Will they ban binary triggers?

The Senate Bill Number 8 was amended to include a “rapid fire device” that is any device or accessory that can be added to a semi-automatic weapon to increase the rate of fire, which definitively bans binary triggers.

Are binary triggers practical?

Binary triggers allow you to shoot numerous rounds rapidly. Almost as if shooting with a fully automatic gun. This can be useful in many situations, and also more importantly, it can be a lot of fun at the range! Getting your hands on one is relatively easy in most states.

Can you bump fire with a binary trigger?

Adding a bump stock to a rifle equipped with a binary trigger would most likely cause malfunctions. The rifle simply wouldn’t fire. The Franklin Arsenal binary trigger is meant to be run fast, but not too fast.

Can the M249 be Mag Fed

The M249 is a gas-operated, belt/magazine-fed, air-cooled, automatic, and also shoulder-fired weapon. Like the M240B machinegun, the M249 fires from the open-bolt position. It can fire ammunition from an M16 magazine as well as from a linked belt. (closed bolt, semi automatic version, belt fed, franklin armory ).

FAQ On Binary Triggers

Why would you want a binary trigger?

A binary trigger increases a weapon’s firing speed. Unlike a bump stock, it is legal in most states. It allows a firearm to shoot one bullet when the trigger is pulled and one when it releases. A 30-round magazine can be emptied in about three seconds (FN M249S semi auto).


You will have the same cardinal directions for SAFE/SEMI/FULL they just add Binary to the 6 o’clock position. According to Sun, Binary mode is reached by rotating the selector up from safe. Also, you cannot continue to Full Auto from Binary.

    • What does it mean when a AR has a binary trigger?

    A binary trigger is a replacement trigger that features two modes of firing, semiautomatic and also binary or “echo” in the case of one brand. This binary trigger mechanism allows the user to fire whenever you pull the trigger and then to fire again with the release the trigger.

    • How fast are binary triggers?

    Depending on the gun, they can fire between 400 to 800 rounds per minute. According to the Gun Control Act of 1968 and also the National Firearms Act of 1934, bump stocks and similar devices are classified as “machine guns.” Machine guns enable a shooter to start continuous firing with a single trigger pull.

    • Can a gun shoot if the trigger is not pulled

    It is exceedingly rare for a gun to fire without the trigger being depressed. Modern firearms, even replicas of antique guns, have safeties specifically designed to prevent them from firing without the trigger being pulled.

    This triiger is made by FN so you know it will fit your M249S.

    Sorry, all prices are subject to change depending on availability and manufacturer increases.

    Ships UPS Ground to your home, no FFL Required.

    Use of Licensed Gunsmith highly recommended.

    Any questions about use or to place an order, please contact us -

    JS Firearms Sales & Accessories, LLC

Phone: 480 612 4799


    JS Firearms Sales and Accessories LLC, Everything 37mm and Exotic, 45acp, 38 Special, 357 Magnum, 22LR, 22 WMR, 44 Special, 44 Magnum, Uppers, Lowers, NFA Items, Hunting, Preppers, Bug Out, Survivalist, 50BMG, 338 LAPUA, 3006, 308, Camping, Hiking, Perimeter Defense, Grenades, Explosives, Flash Hiders, Suppressors, Silencers, Handguns, Pistols, AR Style, AR10, AR15, 556, 223, Creedmoor, 300 Blackout, Optics, Red Dot, Magazines, Drum Mags, AK47, 762x39, 762x51, We Manufacture, Build to Soot, Triggers, Targets, Ear Protection, Bulk Ammo, Ammunition, Big Game, Gunsmith Services, Target Shooting, Rope Ladders, Concealed Carry Permit, FFL Transfers, Machine Guns, SBRs, SBAs, SBS, Firearms Braces, ATF Rules, Girls with Guns, Competition Shooting, Custom Firearms, Threaded Barrels, Long Distance Shooting, Firearm Training, Rifles, Shotguns, Double Barrel, Semi Auto, Pump Action, Single Barrel, Rare, Collectible, Firearm Appraisals, Gun Ownership, Best Buy 4 Guns, Firearm Sales, Coupons, Life Time Warranty, Exotic Ammo, 12 Gauge, 410, 20 Gauge, Shotgun Shells, Hunting Ammo, Target Ammo, Self Defense Ammo, Armor Piercing, USMC, US Military, NATO, Veterans, Veteran Owned Company, War Games, Camo, Camouflage, WW2, WWII, Korean War, Vietnam, Jungle Fighting, Gun Shop, Firearms Sale, Relics, USA, America, American Flag, Patriots, Second Amendment, 2A, Cowboys, Gun Fights, Fast Draw, Explosives, Warning Signs, VA, Law Enforcement, Back the Blue, Uniforms, Boots on Ground, Replicas, Antiques, Mailing List, Pre Order, Pre Payment, Payment Methods, ATF License, Death from Above, Airborne, Used Equipment, Used Firearms, Military Surplus, Used Guns, New Guns, New Firearms, Firearm Repairs, Belt Fed, Ammo Packs, FN, Barrett, Ohio Ordnance, ArmaLite, Accuracy International, Serbu, Sniper Rifles




    • Warranty

      • .
      • This item is under warranty by FN, the manufacturer. Any issues please contact FN Warraty Department for repair issues
    $729.00 Regular Price
    $649.00Sale Price
    Approximately 10 days from Pre Order and Pre Payment received
    bottom of page