The Light Phaser was a light gun created for the Sega Master System, modeled after the Zillion gun from the Japanese anime series of the same name. The phaser was heavier than its Nintendo counterpart, the Nintendo Zapper, but considered by some to have a more responsive trigger and more accurate targeting. As with the Japanese-market Nintendo Zapper, the Light Phaser looked realistic enough to warrant parental pressure to alter the device so that police would not confuse it with a real gun. Altered Light Phasers are distinguished by a hand-painted neon orange tip and are much rarer than their solid color counterparts. Tec Toy also released a blue Light Phaser in Brazil.
Source: Wikipedia, "Sega Master System," available under the CC-BY-SA License.