A rotational safety device for a firearm is provided that replaces a traditional cross bar safety device. The safety device is easier to operate and easier for a firearm user to assess whether the firearm can be fired than previous safety systems. The safety device of the present technology involves setting a safety to “fire” or to a no fire or “safety on” position by causing a safety member installed within a trigger mechanism to rotate about an axis. The safety device may include a recessed portion that may be rotationally positioned to face a trigger to allow the trigger to be completely depressed. The safety device may also include one or more locking positions in a range of rotation, physical limits on the range of rotation such as pins that engage surfaces of a firearm, and may be used with a variety devices to provide rotation.