Franklin Armory BFSIII AR-C1 Binary Trigger Install

I recently had the chance to review and work with the Franklin Armory BFSIII AR-C1 Binary Trigger. I had to spend a lot of time doing the scuffles and even a little walk through the woods, which will go live in another article. Before I could do that, I had to fit it into a couple of AR15 rifles. I thought a good installation article would help some people out there who are learning more visually. Let’s go to the bank!

AllOutdoor-Test: Franklin Armory BFSIII AR-C1 binary trigger installation

1. The first is the first! Practice all the rules of gun safety. When disassembling and assembling a weapon, you should always wear protective goggles, as several parts are under spring tension. Check three times that the gun is unloaded. Check the chamber, magazine, and the area in between. I strongly recommend reading the installation instructions supplied or viewing the installation instructions here. Everything ready? Let’s jump right in!

The BFSIII AR-C1 comes with the following: An assembled trigger / isolator / slave pin, Ambidextrous safety selector, ignition mode sticker, slave pin (and extra), additional separator spring, two buffer springs (one is stronger), manual, Franklin Armory Safe-Semi-Binary Red sticker.

BFSIII AR-C1

2. This part is optional. The BFSII AR-C1 contains two additional buffer springs. One is stronger than the other and this is due to possible bicycle problems that you may have with prolonged use of your factory buffer spring. Simply press (the buffer is under spring tension, please note!) The buffer holding piston and let the buffer and the spring come out in the direction of the lower mount. Pull this out and replace the buffer with a new spring and repeat the process in reverse order to install it.

BFSIII AR-C1

3. Assuming you’ve already separated the top and bottom, start by removing the AR15 pistol grip. Use a 3/16 hex wrench / Allen key to loosen the screw hidden in the pistol grip.

BFSIII AR-C1

4. Pay attention to the spring and plunger pushed by the handle. You can fall freely from below.

BFSIII AR-C1

I always make sure to take them out so I don’t lose them.

BFSIII AR-C1

5. After removing the depressed spring and plunger from the pistol grip, you can remove the safety selector. It may take a few turns, but the selector switch can be rotated until it can be pulled freely.

BFSIII AR-C1

6. Now let the hammer run forward carefully by pulling the trigger.

BFSIII AR-C1

7. If the hammer is left forward, you can now remove the pin holding it in place. The pin can be driven out in either direction, but be sure to use a bench block or have it carefully mounted in a jig on a vice.

BFSIII AR-C1

8. After you remove your stamp, the hammer will start to loosen on its own. You can take it out, just pay attention to the tension of the spring.

BFSIII AR-C1

9. Now we can remove the release pin. Before doing this, confirm that a circuit breaker is also spring-loaded, as well as the trigger itself, which is also spring-loaded and will come loose when the pin is removed.

BFSIII AR-C1

Cover the top of the receiver with a rag or your hand to catch anything that might pop out.

BFSIII AR-C1

10. If you are applying the BFSIII AR-C1 sticker (recommended for safety reasons), prepare the area by degreasing it. A small amount of acetone would do the job. Wipe off any areas that won’t dry.

BFSIII AR-C1

Note: some bottom receivers have aesthetic features that make it impossible or unlikely to apply the sticker. Like this Springfield Armory Edge PDW.

BFSIII AR-C1

11. Carefully apply the sticker. This can also be a one-off attempt as the sticker will dissolve in two layers and be aggressively processed.

BFSIII AR-C1

12. Now we can install the pre-made trigger. Be careful not to move the slave pin in the trigger assembly. Insert the assembly into the lower one in the configuration shown below. Make sure the spacers are in place on the trigger assembly (more on this below).

BFSIII AR-C1

Note: Here we can see the correct orientation of the trigger and hammer in the bottom, but more importantly, we can see the spacers and their correct orientation. They have normal one-piece triggers built in. The manual says nothing about what could really baffle someone who is not used to this. The spacers are used to ensure that the hammer spring tails rest on the inside of the receiver.

BFSIII AR-C1

13. The installation of the trigger is very easy. Insert the trigger into the receiver with the spacers attached, aligning the slave pin with the pin hole. Insert a trigger pin and punch the pin through to replace the slave pin.

BFSIII AR-C1

14. Now that the trigger is mounted, the hammer can be used. The springs should be placed so that they line up with the notches on the trigger spacers. The hammer will be under tension, but must be pressed into the base with one hand and the pin to which it is to be connected must be inserted.

BFSIII AR-C1

15. Pull the hammer out of its faucet by pulling it backwards and it should click into place.

BFSIII AR-C1

16. Now you can insert the selector. The selector has to be turned here and there so that it hits completely. Screw the other side of the selector switch all the way through.

BFSIII AR-C1

Note: The distance between the selector and the frame is normal and most likely is used to compensate for the increased space with different receivers.

BFSIII AR-C1

17. Now reassemble the pistol grip components. I usually turn the lower one upside down and put the plunger in and the spring on top before gently squeezing it with the pistol grip.

BFSIII AR-C1

18. Once everything is back in place, there is a long list of safety tests that should be performed before bringing your BFSIII AR-C1 within range. The safety list can be found in the manual or here in the installation video. If for any reason you need to contact Franklin Armory Customer Service with a technical question, their phone number is 775-783-4313 (Monday through Friday 9:00 a.m. – 4:00 p.m. PT).

BFSIII AR-C1

Finally, many thanks to everyone who tuned in and participated! Check out Franklin Armory and their products. I hope this has been helpful and educational. Please always remember to practice proper gun safety and pay attention to parts so you don’t lose any. Safe and happy installation!

BFSIII AR-C1

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