Jerry Miculek is at it again with the unicorn guns. This time he gets to try out a FN CAL. It is designed like the FAL but is chambered in 5.56. The selector switch is very interesting. It of course has safe, semi and full auto but it also has a 3 round burst. And according to Reed Knight, the FN CAL has a sort of “clock escapement mechanism” that resets the 3 round burst. So if the shooter lets off after the first or second round in a 3 round burst, the gun will reset it self to fire another 3 round burst at the next trigger pull.