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Franklin Armory
Overview
The Franklin Armory BFSIII HK-C1 Binary Trigger is designed specifically for AR-15 platforms, offering a unique binary firing mode that allows the shooter to fire on both pull and release of the trigger. This feature enhances the firing rate and provides a different shooting experience, giving builders the ability to achieve rapid follow-up shots. This trigger is often found in builds featuring a mid-length gas system and chambered in 5.56 NATO, making it a popular choice for those looking to optimize their performance on the range.
Prices checked
Franklin Armory BFSIII HK-C1 Binary Trigger - 05-50000-Black ranked #24 of the 228 triggers builders added on GunPartPicker in September 2026, behind the Timney AR-15 Impact Trigger Flat Black 3lb, with about 1 in every 167 triggers added to builds. Up from #46 in August. Builds with this trigger are mostly chambered in 5.56 NATO (70%, then 300 Blackout 16%), split between mid-length (37%) and carbine-length (30%) gas systems, and mostly AR-15 (83%, then AR-10 16%).
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 3 of the 5 retailers we track have it in stock. Prices barely moved in September 2026, holding around $629.99, so there haven't been real sales lately. Buying today, the lowest price is $629.99 at BattleHawk Armory, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
We ranked every trigger by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Trigger Popularity Report →Check it against the live catalog:
The part most often added in each category by the builds that include this one
Knights Armament Sr-25 Lower Receiver 7.62mm
Magpul AR-15 MOE Stock Fixed Commercial Black
FightLite Industries MCR556DFRM AR-15 Upper 5.56x45mm NATO 16.25\" Black 7075-T6 Aluminum M-LOK Handguard
Radian Raptor Charging Handle & Talon Safety Selector Combo - OD Green
EOTECH 3x30.5mm X 21.6mm Holographic Hybrid Green Dot Sight - HHSGRN
LMT Full-Auto 5.56 Enhanced AR-15 Bolt Carrier Group
Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Franklin Armory BFSIII HK-C1 Binary Trigger - 05-50000-BLK
| Build | Parts | Total |
|---|---|---|
 | 14 | $9240.28 |
 | 11 | $5421.38 |
 | 12 | $2697.14 |
 | 17 | $6658.53 |
 | 21 | $8726.22 |
 | 14 | $1075.70 |
1 global rating
Top reviews
binary trigger from franklin armory, the pull and release modes work as advertised. semi mode is crisp at the listed pull weight. binary mode is fun and reasonably controllable at close range. install was direct on a mil spec lower
