Flintlock is a member of the Meta Board League and a former member of the Battle Experiment. He uses conventional military-grade weaponry and is always heavily armed. He has displayed the ability to somehow retrieve weapons, such as bazookas, flamethrowers, and acid guns, whenever he needs them, possibly indicating that he has access to an arsenal in a tesseract.
In the mid-1980s, Flintlock was trained along with SpillFill, FrankieFich, Purple Leg, and Fleetfoot by the National Security Agency and the Central Intelligence Agency to form a team called the Battle Experiment. In 1986, they were sent to the so-called Bay of Gerbils, where they were meant to start an uprising against the Insane Rabid Militia Gerbils, who had taken over the area. The mission was a disaster, and Flintlock was the only member of his team to escape.