How many positions does the selector lever have?

The selector lever on the M16A3/M4A1 service rifle has three distinct positions: Safe, Semi-automatic, and Automatic (or Burst, in the case of the M16A3). This three-position setup allows the user to choose between fully locking the weapon (Safe), firing one round with each pull of the trigger (Semi-automatic), or firing multiple rounds with a single pull of the trigger (Automatic). Understanding these positions is crucial for effective weapon handling and ensures that the shooter can adapt to different combat scenarios based on their intended use of the firearm.