The Franklin Armory 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 poundsAmbidextrous Safety SelectorSafety Selector will fit in most two and three position trigger housingsWorks in SP5K housingsTrigger housing ejector ejector pin and ejector spring are not includedWill fit most HK 91 93 & MP5 variants and clonesSome firearms may require additional fitting