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Franklin Armory
Overview
The Franklin Armory BFSIII AR-S1 Binary Trigger is designed specifically for AR-15 and AR-10 platforms, offering a unique binary firing mode that allows the shooter to fire on both the pull and release of the trigger. This feature enhances the shooting experience by providing a rapid-fire capability, making it ideal for competitive shooting and tactical applications. Commonly, you'll find this trigger in builds featuring a mid-length gas system and chambered in 5.56 NATO, where its responsiveness can significantly elevate performance.
Franklin Armory BFSIII AR-S1 Binary Trigger - 5645A ranked #20 of the 240 triggers builders added on GunPartPicker in August 2026, behind the CMC Triggers Pcc 9mm Trigger Single Stage Curved 3 Lb, with about 1 in every 143 triggers added to builds. Up from #36 in July. Builds with this trigger are mostly chambered in 5.56 NATO (74%), split between mid-length (53%) and carbine-length (32%) gas systems, and mostly AR-15 (91%).
It was out of stock everywhere we track for all of August 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $249.99 at Palmetto State Armory for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 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:
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Franklin Armory BFSIII AR-S1 Binary Trigger - 5645A
| Build | Parts | Total |
|---|---|---|
 | 18 | $1772.11 |
 | 22 | $1752.67 |
 | 27 | $1958.47 |
 | 25 | $2300.16 |
 | 20 | $4995.98 |
 | 22 | $1377.49 |
1 global rating
Top reviews
Franklin Armory BFSIII AR-S1 binary trigger has a clean break in semi mode and a fast binary mode that fires on press and release. A bit light for duty use which is appropriate for a recreational trigger. Excellent for range fun.
