Franklin Armory BFSIII HK-C1 Binary Trigger 5603A

Turn your roller-lock platform into the ultimate range machine with the Franklin Armory BFSIII HK-C1 (Gen 3 Binary Firing System). Engineered to drop directly into standard, pull-out semi-automatic HK trigger housings, this premium 3-position trigger pack brings legal, lightning-fast rapid fire to one of the smoothest cycling platform designs in history.

The HK-C1 kit features a traditional curved trigger bow and includes a custom, proprietary ambidextrous 3-position safety selector lever designed to seamlessly clear two- and three-position factory pictograph or lettered trigger housings.

The safety selector unlocks three distinct operational modes:

1. Position 1 (Safe): Firearm is locked and will not discharge.

2. Position 2 (Semi): Standard semi-automatic fire (one round per single pull of the trigger).

3. Position 3 (Binary): True pull-and-release mechanics. The firearm drops the hammer once on the pull stroke and once on the release stroke, drastically shrinking your split times and keeping your groupings incredibly tight.

Note: Built with Franklin's built-in cancel feature—if you pull the trigger in Binary mode and decide not to fire the release round, simply keep the trigger depressed, flick the safety selector back to Semi or Safe, and let go without releasing the hammer.

Specifications & Fitment:

• Model: BFSIII HK-C1

• Factory SKU / MPN: 5603A

• Platform Compatibility: Fits most HK MP5, SP5, SP5K, HK91, HK93, and high-quality clone variants

• Trigger Pull Weight: Approximately 4.5 lbs.