Franklin Armory BFSIII HK-C1 Binary Firing System Trigger - 5603A
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Franklin Armory
Overview
Franklin Armory BFSIII HK-C1 Binary Firing System Trigger - 5603A | AR-15 | Binary The Franklin Armory BFSIII HK-C1 is a binary trigger system for AR-15 platform rifles. It provides three modes: safe, semi-automatic, and binary, which fires one round on the pull and one round on release. This trigger system is designed as a drop-in replacement for standard AR-15 triggers. GPP build data shows this trigger commonly appearing alongside the Knights Armament SR-15 MOD2 5.56 NATO upper receiver and Knights Armament SR-15 IWS complete lower receiver. These builds are most often chambered in 5.56 NATO. Builders on GPP commonly pair this trigger with the Battle Arms Development AR Rifle Ultralight Chevron carbon fiber pistol grip and the FAB Defense GL-Core M CP stock.
Pros
- +- Compatible with the most common AR-15 platform. - Binary triggers are a less common option, offering faster firing capabilities than standard triggers.
Trade-offs
- −- This trigger is a binary type; most triggers in the catalog are single-stage.
Specifications
September 2026 on GunPartPicker
Franklin Armory BFSIII HK-C1 Binary Firing System Trigger - 5603A ranked #52 of the 228 triggers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #81 of the 465 triggers builders have added. Builds with this trigger are nearly all chambered in 5.56 NATO and nearly all AR-15.
Today the one retailer we track has it in stock. Buying today, the lowest price is $629.99 at Classic Firearms.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
The part most often added in each category by the 35 builds that include this one
Franklin Armory 2012 BFS Marked Stripped Lower Receiver
Fightlite Industries MCR-556-DFR 5.56 NATO 16.25" Upper Receiver Assembly
EOTECH 3x30.5mm X 21.6mm Holographic Hybrid Green Dot Sight - HHSGRN
Maxim Defense Industries CQB Stock Standard Buffer & Spring Black
JP Enterprises Silent Captured Spring for Law Tactical Folder
Radian Raptor Charging Handle & Talon Safety Selector Combo - OD Green
Builds Featuring This Part
See all 1 →Builds in the community that include the Franklin Armory BFSIII HK-C1 Binary Firing System Trigger - 5603A
| Build | Parts | Total |
|---|---|---|
 | 16 | $2290.42 |
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