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The Franklin Armory BFSIII HK-C1 is a three-position trigger built to bring the Binary Firing System to the roller-lock crowd. It runs three modes: Safe, Semi, and Binary. In Binary, you get one round on the pull and one on the release, which is what makes this one of the fastest semi-auto triggers you can bolt into an HK-style host. In Semi it behaves like a normal single-fire trigger, so you can slow things down whenever you want.
The magic here is split time. Because you get a round on the release, the gap between shots shrinks way down compared to a standard trigger, which lets you plant two separate hits into a tighter group. Three-gun folks, HK enthusiasts, and anyone who just wants a genuinely fun range gun tend to gravitate toward this system. The trigger breaks at right around 4.5 pounds, so it feels controllable rather than mushy or gritty. If you ever have the trigger held back in Binary and decide you don't want that release shot, you flip the patented selector back to Semi and let off safely to cancel it.
This unit drops into most HK 91, 93, and MP5 variants and clones, and it works in SP5K housings too. The ambidextrous safety selector fits most two and three position trigger housings, giving lefties and righties an easy reach. Worth knowing before you order: the trigger housing, ejector, ejector pin, and ejector spring are not included, so plan on sourcing those or pulling them from an existing pack. Some housings need a little fitting to seat everything correctly, and given the tight tolerances of these packs, having a qualified gunsmith or Franklin Armory Certified Armorer handle the install is the smart move.
Finished in black to blend right in with typical HK setups, the HK-C1 is a serious upgrade for anyone looking to wake up their 91, 93, or MP5. Get proper training on running a binary trigger before you take it out, and you'll have one of the more entertaining and capable triggers on the HK market.
In its third position, Binary mode, the trigger fires one round when you pull it and a second round when you release it. This dramatically reduces the time between shots and helps you place two rounds into a tighter group. In the Semi position it functions like a standard single-fire trigger, and Safe locks it out entirely.
It fits most HK 91, 93, and MP5 variants and clones, and it also works in SP5K housings. The ambidextrous safety selector drops into most two and three position trigger housings. Some housings may need a little additional fitting, so it's smart to confirm your specific host before installing.
No. The trigger housing, ejector, ejector pin, and ejector spring are not included with this trigger. You can pull those from an existing trigger pack or source a separate ejector assembly, and many owners find dropping the BFSIII into a dedicated housing to be the more convenient route.
These trigger packs have very tight tolerances, and some housings require fitting to seat properly. Franklin Armory recommends installation be handled by a professional gunsmith or a Franklin Armory Certified Armorer. Once it's installed, getting qualified training on running a binary trigger before live fire is strongly advised.
| UPC | 818725011436 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 05-50000-BLK |
| Caliber/Gauge | Multi |
| Length | 8.8000 |
| Model | |
| Package Height | 6.0 |
| Package Width | 3.0 |
| Product Type | Accessory-Triggers |
| Shipping Weight | 0.62 |
| Style | Binary |
| Units per Box | 1 |
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