what is a binary trigger

A binary trigger is a device that allows a semi-automatic firearm to fire at an increased rate. It works by firing one shot upon pulling the trigger and then firing a subsequent shot upon release of the trigger. This allows the firearm to double its firing capacity, essentially increasing the rate of fire. Binary triggers are installed through modification of the fire-control group and have become popular in the United States, especially after the 2017 Las Vegas shooting. They are legal in most states and at the federal level, but some states have tougher legislation regarding their purchase and use