Which part of the pistol is responsible for returning the trigger to its original position after a shot is fired?

The trigger return spring is the component of a pistol that ensures the trigger resets to its original position after the trigger has been pulled and a shot has been fired. When the shooter pulls the trigger, the spring is compressed. Once the shot is fired, the spring expands, pushing the trigger back to its starting position. This mechanism is crucial for the operation of semi-automatic and automatic pistols because it allows the shooter to quickly fire additional shots without needing to manually reset the trigger.

The other components mentioned do not fulfill this function: the slide lock is designed to hold the slide in the open position after the last round is fired; the back strap relates more to the grip and comfort of the shooter rather than the trigger mechanism; and the frame/receiver houses all the internal components and provides the structure of the firearm, but it does not actively return the trigger to its original position.