Franklin Armory 5603A Binary Firing System H&K 91/93/MP5
Franklin Armory

Franklin Armory 5603A Binary Firing System H&K 91/93/MP5

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Out of Stock. 0 Available
UPC Barcode:818725011436
Part Number:5603A
  • Not for civilian sales in CA, DC, IA, NJ, NY, HI, RI, FL, MD, CT, or WA.
  • Only for use in pistols in Delaware

The BFSIII for HK is a 3-Position Trigger. In position 3 it will fire 1 round on Pull and 1 round on Release. This makes it the fastest semi-automatic trigger on the market. The BFSIII is ideal for Tactical and Competition use. The BFSIII provides greatly reduced split times between rounds and the ability to place two separate shots into a tighter group.


- A trigger pull around 4.5 pounds.
- Ambidextrous Safety Selector.
- Safety Selector will fit in two and three position trigger housings.
- Will not work with Ambi Housings
- Trigger housing, ejector, ejector pin and ejector spring are not included.


- Fits: Most HK 91, 93, & MP5 variants and clones
- Some firearms may require additional fitting
- Trigger Operation:
Position 1 – Safe –Will not fire.
Position 2 – Semi – Fires 1 round per pull.
Position 3 – Binary – Fires 1 round on pull and 1 round on release.

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