The Binary Firing System®  GEN 3 (BFSIII®) is a 3-position trigger. In position three it fires one round on pull and one round on release making it the fastest semi-automatic trigger on the market. This trigger is ideal for both tactical and competition use. The BFSIII® provides significantly reduced split times between rounds allowing for tighter groups. For 7.62x39, 5.45x39, 5.56 NATO  model:  No underfolding AK stocks No 12 Gauge shotgun platforms, not tested with other gauges Not yet tested with .308 platforms Not recommended for Arsenal AK platforms Some firearms may not be compatible with this trigger The AK-C1 is NOT designed for use with Pistol Caliber AK Platforms For 9mm  model:  No underfolding AK stocks The AK9-C1 is designed for use with 9mm AK platforms Not recommended for Arsenal AK platforms Some firearms may not be compatible with this trigger Specifications for Franklin Armory BFSIII AK-C1 Trigger - Binary Firing System for AK Platforms: Manufacturer: Franklin Armory Color: Black Gun Model: AK-47 Gun Type: Rifle Condition: New Features of Franklin Armory BFSIII AK-C1 Trigger - Binary Firing System for AK Platforms: Release round can be canceled by simply moving our Patent Pending selector out of Binary® mode while holding the trigger back Easy to install Positive reset on release phase Great for competition shooters, tactical shooters, and recreational enthusiasts Trigger Pull weight ~5.5 lbs. +/- .5 lbs. Binary Firing System™ waiver and release Package Contents: Franklin Armory BFSIII AK-C1 Trigger - Binary Firing System for AK Platforms