Click to see full view
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.
Specifications
Franklin Armory BFSIII AR-S1 Binary Trigger - 5645A
October 2026 on GunPartPicker
Franklin Armory BFSIII AR-S1 Binary Trigger - 5645A ranked #145 of the 262 triggers builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #40 of the 555 triggers builders have added. Builds with this trigger are mostly chambered in 5.56 NATO (64%, then .308 Win 9%), split between mid-length (54%) and carbine-length (31%) gas systems, and mostly AR-15 (85%, then AR-10 9%).
It was out of stock everywhere we track every time we checked in October 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 37 retailers
Not sure which trigger to pick?
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:
Frequently Built With
The part most often added in each category by the builds that include this one
Wilson Combat AR-15 Lower Receiver Forged
Wilson Combat AR-15 Billet Upper Receiver
Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black
Bravo Company Manufacturing AR-15 Bolt Carrier Group - M16
Magpul AFG-2 Angled Fore Grip - Black
HEXMAG Rubber AR-15 Tactical Pistol Grip, Black - HX-HTG-Black
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the Franklin Armory BFSIII AR-S1 Binary Trigger - 5645A
| Build | Parts | Total |
|---|---|---|
 | 18 | $1792.23 |
 | 22 | $1845.89 |
 | 27 | $1773.23 |
 | 25 | $1950.87 |
 | 20 | $5015.73 |
 | 22 | $1131.70 |
No reviews yet. Be the first to review this product!