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Franklin armory bfsiii hk-c1 trigger - binary firing system for hk 91/93/mp5 - Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5
by
Ronin48,
Verified Owner
from NC, United States
Written on August 15, 2025
Ronin48's Review of Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5
I purchased this binary trigger for my MKE/Century Arms MP5/AP5. I installed it the same day it arrived. Delivery was faster than I expected. Read the instructions and it was easy to install. Not as complicated as the video online from Franklin Armory would lead you to believe. The video was more confusing than helpful, follow the instructions that comes with the kit and you'll do fine. Test fired the weapon also the same day. Very impressed. It isn't the same as a full auto MP5, which I had the privilege of firing when in the military, but this kit makes no such claim, it is binary not full auto. It reminded me more of a Gatling gun rate of fire. Now as I shoot it more, and find that "sweet spot" in my triggering technique, it may ultimately have a higher cyclic rate and as it "breaks in" but overall I'm impressed with it and Optics Planet had a special code at the time discounting it, so the kit cost me $585, not the $629 that you see advertised by most other vendors currently. I think it was 13% off the regular price, which is better than my military discount. Anyway, if like me you can't afford a real class 3 full auto MP5, but owning one that comes close is on your bucket list, pull the trigger on this kit.
Pros:
As close as you can legally get to a full auto MP5 without a class 3 license.
Cons:
A little pricey, but anything related to a HK MP5 is...nuff said LOL.
Best Used for:
FUN, home/self defense, accurate quick double taps.
Would Recommend:
Yes
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