Success! AR-trigger fitted to the B&T APC

With B&T Firearms now available in the US there is more and more activity in various groups on social media. Before there were only really a few selected individuals who could own B&Ts, mainly in Europe.

To reply to some of the comments and criticism I’ve seen in the feedback here. Yes, some of the writers here at TFB do own B&T firearms. For instance, I have two B&T APC9s (SBRs).

And they do a lot of R&D and push out a lot of new interesting products, therefore you see them in your flow although they might be a relatively small company.

Ever since I bought my first B&T APC and had a closer look in the insides I’ve been wondering if an AR trigger would fit?

I’ve been to the B&T factory in Thun, Switzerland, I’ve been to the B&T stands at many exhibitions but no one could really reply to my question if an AR15 would fit. The question was kind of avoided.

I’m no gunsmith, but the trigger pin playout in the APC9 is the same as the AR15, and there are many other similarities.

The trigger on the B&T APC9 isn’t bad, but it can be improved.

Instead of breaking my APC9 apart I chose to leave it. My curiosity was still there, but I wanted to own an original product with B&T only inside and outside.

Thankfully Peter Jancola in the B&T Firearms Facebook group had the courage to find out for us. With his permission you can read about his experience and watch these pictures.

He took his APC9 apart and put an Elftmann Tactical AR10 trigger in it. Not a bad choice, they make great triggers. Here’s his story:

Just wanted to follow up with the trigger swap. Incredibly happy with the set-up, I’ll be doing it to my APC233 next! I have the trigger set at just shy of three pounds. It is incredibly crisp, as the Elftmanns always are, and gun shoots way faster. I ran about 300 rounds through it without a hiccup. On a side note, using a drop in trigger requires anti-walk pins (AR ones are too short to work on the B&T receiver), the Elftmann trigger has screws that tension it against the bottom of the receiver and against the pins and keeps them from falling out.


I went with the AR-10 version of the trigger because it has a slightly heavier Hammer, it’s what I had to put in my 9mm AR to get it to run properly.

I have been told by someone at B&T that an AR fire control group can be swapped out with the B&T FCG. The drop in triggers is where it gets tricky. The differences are things like the width of the receiver, the hammer and sear pins are slightly longer on the B&T because the receiver is slightly wider. Those kinds of differences aren’t going to make any differences in terms of functionality.


The pin locations and layout is identical to an AR15 FCG, it’s the FCG pocket in the lower that isn’t compatible with all drop-in AR15 triggers. Essentially, B&T used their own AR15 trigger made in house for the APC’s, as you can take them out and install them in a standard AR in just the same way. Why start from scratch with a FCG when there’s a perfectly good FCG already available with tons of aftermarket support? Sort of like how the Mega Arms Maten is an AR10 but uses an AR15 FCG while the lower isn’t machined to standard pocket specs. They both accept AR15 triggers, they just won’t accept ALL of them. Has nothing to do with liability.


The APC utilizes in AR style trigger. Any mil-spec AR trigger will fit in the APC. The key being mil-spec which makes many drop-ins a bit challenging however they do work. I was able to modify a CMC drop in and it worked fine. One of the things you lose however is the ability to put the weapon on safe when it is not charged. It’s just a feature that domestic trigger manufacturers do not incorporate like the Europeans.

The B&T receiver is thicker than an AR receiver so you can’t use traditional anti-walk pins. The Elftmann comes with a small plate and tensioning screw that tension it between the bottom of the receiver and the pins, holding them in place the same way anti-walk pins would.


Obviously, as we’re dealing with firearms and safety. If you decide to make this trigger swap or modify your B&T firearm please make sure you know what you’re doing and check with the producer before.

You can find more information about Elftmann Tactical here:

Eric B

Ex-Arctic Ranger. Competitive practical shooter and hunter with an European focus. Always ready to increase my collection of modern semi-automatic firearms, optics and sound suppressors. Owning the night would be nice too.


  • Pete – TFB Writer

    Very cool. Thanks Erik. I want to put a binary trigger in my APC9. If it would fit…

    • Pornocarl

      Ahhh… it’s refreshing to hear someone else has the same idea I did. The biggest problem I see is the selector.

      • Peter Jancola

        Carey at Hi Caliber Mfg is developing a replacement safety selector. So far it looks pretty good.

    • TheUnspoken

      I wonder if separate trigger groups would ever be available? (What you call lowers in the AR world but they aren’t the serialized firearm). Then we could have different trigger configurations in an easy, but probably expensive, ready to go set. Similar to HK groups and packs.

      • Hunter

        I thought the serialized par aka. Firearm is the trigger/grip pack, is this not the case?

        • Christian Hedegaard-Schou

          In the US, by BATFE regulations (not actual law), the portion of the firearm that contains the fire control group is generally considered the receiver, and is ultimately the controlled part. But again, this is not law, it’s just how we do things based on BATFE guidance.

          However, in most European countries barrels and bolts are the controlled parts, and they don’t really control what we call receivers. Because of this, European firearms typically put the serial number on the part of the gun where the barrel and bolt mate up, which is the “upper” receiver in many designs. FAL, SCAR, MP5, etc all have a serial’ed upper, instead of FCG.

          So when you get European imports, the controlled “receiver” is generally not what you would expect.

          • It really depends on the design of the gun, as to how ATFE rules. Basically, ATF tries to figure out the part you HAVE to alter in order to turn a legal semiauto into an illegal “machinegun”. FALs, for instance, use the upper receiver as their trackable receiver under US law.

            The AR15 really threw ATF, because it was a case of a major, readily available, domestically produced gun for which full auto trigger groups were available, but the upper receiver (unlike just about every other “two receiver” gun ATF had to deal with on a major basis) had absolutely nothing to do with whether the gun could run full auto.

          • Christian Hedegaard-Schou

            Yes. I pointed out the FAL. Because it’s a European design (Belgium) where typically bolts and barrels are controlled, making the upper (where the bolt rides and barrel is threaded into) the controlled part in the US.

  • JumpIf NotZero

    Is that a stock or a brace?

    • GaryOlson

      It’s an artistic extension and expression of the meld between man and machine in the modern world.

    • Suppressed

      I believe it’s a brace. SB tactical’s new line of braces are aesthetically leaps and bounds ahead of their old stuff. They have finally pushed me over the line enough to motivate me to build a pistol/pseudo-SBR without having to ask for a permission slip. I’m saving the funds while I decide whether I want to do an AR or something unique like a PTR 32 pistol/this/Scorpion/etc.

    • Peter

      It is an SB Tactical brace. Went that route instead of a stock so that I can legally keep it loaded in my truck or keep it concealed in a backpack.

  • feetpiece _

    Echo or BFS Test please.

  • Christian Hedegaard-Schou

    To take care of the pins not being long enough, you should be able to get a 1/8″ Chicago screw in the correct length.

  • noob

    Thanks Erik! this is welcome news! What do you think of a hypothetical APC9 SBR with a fostech echo binary trigger and a 22TCM9r barrel? (and suppressor for giggles?)