The American Rifleman magazine ran a nice article about the gun a few years ago.
Two things about the "spin cocking", one was that Connors height let him spin the carbine and not drag the muzzle into the ground, and the other was that they rifle was "modified" to keep the ammo from falling out when he spun it.
The "auto fire" was a setscrew, as others have said, and so not instantly changeable.
However, there is a rapid change design, had one on one of my toys as a kid. Instead of a set screw in the lever to fire the gun, it had an "L" shaped (roughly) piece pinned to the lever, which pivoted by finger pressure alone. Flipped "back", it lay flat against the lever, and did nothing. Flipped "forward/up" it pulled the trigger when the lever was fully closed.
Two things about the "spin cocking", one was that Connors height let him spin the carbine and not drag the muzzle into the ground, and the other was that they rifle was "modified" to keep the ammo from falling out when he spun it.
The "auto fire" was a setscrew, as others have said, and so not instantly changeable.
However, there is a rapid change design, had one on one of my toys as a kid. Instead of a set screw in the lever to fire the gun, it had an "L" shaped (roughly) piece pinned to the lever, which pivoted by finger pressure alone. Flipped "back", it lay flat against the lever, and did nothing. Flipped "forward/up" it pulled the trigger when the lever was fully closed.