Which grip allows for control of the on/off switch with the thumb?

The grip that allows for control of the on/off switch with the thumb is known as the watchman grip. This grip is specifically designed to give the shooter enhanced control over the firearm, including the ability to manipulate controls like the safety or on/off switch without having to shift their grip or take their focus off the target.

In contrast, other grips such as the law enforcement/tactical grip and syringe grip focus more on different aspects of shooting posture and control, such as stability and accuracy, rather than the convenient manipulation of controls. The Ayoob grip, named after firearms expert Massad Ayoob, also emphasizes secure grip and aim, but does not specifically cater to easy thumb access to controls. The watchman grip stands out for its intentional design to facilitate a seamless interaction with the firearm's operational features.