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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.
Franklin Armory BFSIII HK-C1 Binary Trigger - 05-50000-Black ranked #46 of the 240 triggers builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since January 2026. All time, it ranks #30 of the 442 triggers builders have added. Builds with this trigger are mostly chambered in 5.56 NATO (80%, then .223 Remington 20%), split between mid-length (50%) and rifle-length (50%) gas systems, and split between AR-15 (56%) and AR-10 (44%).
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 3 of the 5 retailers we track have it in stock. Prices barely moved in August 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 August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
We ranked every trigger by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Trigger Popularity Report →The part most often added in each category by the 76 builds that include this one
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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 | $12141.44 |
 | 11 | $5425.89 |
 | 12 | $2725.06 |
 | 17 | $6591.86 |
 | 21 | $8461.36 |
 | 14 | $1417.31 |
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
