Franklin Armory Open Pre-Orders For The New HK Binary Trigger

The Franklin Armory Binary Trigger has been a favorite of people looking to make a whole lot of noise and brass without spending the ludicrous amount of money for a transferable machine gun or live in an area where transferable guns are not legal.

The new HK Binary Firing System Trigger is a 3 position trigger that has a safe, semi, and a “binary” position. In the binary position, the trigger will fire a single shot when the trigger pulled, then another when the trigger is released making it the fastest semi-auto trigger on the planet. It will feature an ambi safety selector and will fit in two or three position trigger housings.

Franklin Armory hasn’t released a list of what it will and won’t fit but they do say it will fit most HK 91, 93, and MP5 variants and clones but some firearms may need additional fitting. Below is a list of specs from the press release.

*  A trigger pull around 4.5 pounds.
*  Ambidextrous Safety Selector.
*  Safety Selector will fit in two and three position trigger housings.
*  Will not work with Ambiidextrous Housings
*  Trigger housing, ejector, ejector pin and ejector spring are not included.
*  Will fit most HK 91, 93, & MP5 variants and clones
*  Some firearms may require additional fitting
*  MSRP $699.99

The new HK Binary trigger is great news for HK owners and clone owners that want to experience a higher rate of fire than their checkbook would normally allow. The MSRP of $699 is significantly cheaper than the going rate for a registered sear or full auto transferable gun.

Check out Franklin Armory’s website for more information about the preorder that is scheduled to go live April 28th at the start of NRA’s Annual Meeting in Atlanta.

Patrick R

Patrick is a Senior Writer for The Firearm Blog and TFBTV Host. He likes guns and has liked shooting guns for as long as he can remember. You can follow Patrick on Instagram @tfbpatrick, Facebook, or contact him by email at

The above post is my opinion and does not reflect the views of any company or organization.


  • Christopher Wallace

    dat price doe

    • Harry’s Holsters

      Better than 20k for a transferable and if your really going to use it you’ll burn up that much ammo in 6 months.

      • BlueMarlin Blues

        But it’s not a transferable. No matter how much everyone wants it to be, it’s nowhere near a real MG. Great concept though, we need more innovation like this in the civilian firearms sector.

        • iksnilol

          Am I the only one that thinks it would be great for follow up shots on game?

          Shoot, follow target, release again.

      • Christopher Wallace

        true. but cut the price in half and i bet it sells like hotcakes.

        • Harry’s Holsters

          Cut the price in half and they may not have the margins. Not only are they paying for the cost to manufacturer it but they are also paying for R&D. If These trigger systems for $250 they’d be extremely popular but there may not be any money to be made at that price.

          • Christopher Wallace

            well theres no way these thigns cost 250 to manufacture, so the volume play is prob the way to go.

          • Harry’s Holsters

            It really depending on the manufacturing methods they are able to use. Some methods don’t equate to high volume price breaks. I can see fixtures for a lot of small parts being a nightmare and tooling costs being extreme. Even if they’re cost is $75 a unit based off machine time, materials, finishing, assembly and QC they could still be struggling after paying R&D, Patent attorneys, and tooling costs. With a couple of companies making this style of trigger there has to be a reason someone isn’t selling them in the $200-$300 range.

  • Harry’s Holsters

    They should have used an MP5 in the marketing pic. This is a really cool product and there are a lot more MP5 clone owners than HK33, HK91 clones etc… Great idea though. This concept is more practical for myself in a 9mm platform but I guess the AR triggers would work in a MPX or 9mm AR.

    • Klaus

      The mp5 is already select fire. I think you mean the HK 94 or clones. I really think it would better in the .556 rifle though.

      • Harry’s Holsters

        Edited to say clone

    • alex archuleta

      They should have done this for a derringer.

    • Brett

      The AR trigger should work in those platforms, according to their website. To be honest, I have not seen or heard any issues.

      • datimes

        I have an MPX and found there are a number of proprietary parts. They look interchangeable but are not. My unit is an early gun and the newer guns might be slightly modified.

  • TexianPatriot

    Why do HK before AK?
    There are way more AK owners out there, the market is bigger.
    I already have a version one for my AR and it is awesome. I would definitely drop the coin to put one in my AK.

    • Harry’s Holsters

      A lot more variables in the AK platform considering all the different specs and designs out there.

      • TexianPatriot

        AK rifles may have different specs and designs, but the trigger mechanism is the same on all of them. It can be done. Is it harder? Maybe. But like I said, the market is larger. That means more customers, which means more money.
        I am sure Fostech is working on one, Franklin would be wise to beat them to the market.

        • USMC03Vet

          Not all the same. Even the ALG triggers have to be modified in the more popular arsenal AK to function correctly.

        • Harry’s Holsters

          I heard the reason it took so long for non fitted match grade AK triggers to come out was the varying specs of the triggers. I’ve heard mixed reviews about the ALG trigger and people seem shocked the CMC triggers work. The trigger design is the same but doesn’t mean the specs are which is the real challenge for an AK trigger.

    • Marcus Toroian

      It’s actually pretty simple to do yourself with an AK. In its most basic form, it’s a set screw through the foot of the disconnect, and you adjust the gap between the trigger sear and the disconnect sear hooks. I have my M92 PAP set up like this. I am working on figuring out a way to make it on/off selectable without tools, but it is going to take a bit more technology than I currently have at my disposal.

  • KestrelBike

    This gets me all hot & bothered. But, the price is brutal and [currently] inaccessible to me, and I’m pretty stupid with my $$.

    Some things I wonder because while I love my Zenith 5-RS clone (original mp5 style), I’m not a complete MP5-nut that knows every single term & part#:
    What exactly would I need to buy to make this trigger work? – not asking for people to do my homework, it’s just something I’m wondering.

    I hope Franklin Armory will spell it out better. But, it’s still probably very early days and they’ll probably come out with much more info.

    • Stan Darsh

      You will need to completely breakdown your trigger pack and switch out your trigger, sear, hammer and hammer shank with the new parts and reinstall everything. For the $700 it would have been nice to have an entire trigger pack sent to you instead of 4 small cast parts.

  • Malthrak

    If HMG gets their STG out and this is compatible (since they’re gonna use HK trigger packs), this is gonna be a gold mine methinks.

  • BlackRifleDude

    Holy crap, that’s a little more than 2x the price of my Binary Trigger for the AR!

    • USMC03Vet

      They know HK owners sleep on bales of cash. It’s why they bought HK in the first place. To let the range plebs know who’s royalty.

  • Slim934

    Wowzers. Dat wampums

  • Nick

    Forget HK’s. I want one for my Scorpion Evo. PCC’s are a very lucrative market for this product.

    The MPX can use the AR version, but it’s a more pricey rifle. The CZ is far more budget friendly (both the cost of the gun, and the cost of mags) and is an expanding product line, with Title I rifle variants and an updated pistol version released.

    • Nick

      Oh, and the CZ’s trigger assembly is ideal for since this it is removable as a complete package, making installation a breeze.

    • Joby

      The 10/22 makes a strong case for this. It’s not like it’s the most popular firearm in the US or anything.

    • USMC03Vet

      Trigger cost more than the whole gun!

      Welcome to how absurd the US firearm marke has become.

      • Rogertc1

        Where do you get a HK 91 for $500 now days? Putting it in perspective. The AR-15 Binary trigger is the cost of a low end rifle. (I have the Gen 1 and the Gen 3}

  • M.

    How does this circumvent the ATF law about one bullet per trigger pull?

    • SGT Fish

      Because the law is not “bullet per trigger PULL”

      Words matter

    • Paul Epstein

      The BATFE tech branch determined that pulling a trigger is one action, releasing a trigger that’s been pulled to the rear is a separate action, each user action fires one cartridge. If you pull the trigger with one of these, and keep it pulled, it will only fire the one bullet. Release the trigger, and don’t pull it again, same deal, only fires one.

      This is less ridiculous than the crank-fired guns that have been legal for a while now, IMO.

  • FOC Ewe

    An MP5/10 Clone just got effin sexy

  • Bob

    Did I miss something, or did they fix the hammer follow issues with their AR trigger?

  • Rogertc1

    Will if be able to work in a CETME?