From the Super Mario Wiki
Blasters are versions of Bill Blaster found in Super Mario RPG: Legend of the Seven Stars. They are double-barrelled black cannons with the typical white skull insignia engraved on each side. They shoot Bullet Bills in and out of battle, which made them both typical enemies as well as part of the environment. When engaged in battle, they are shown to acquire aim by moving directly in front of their target. They are especially weak against lightning magical attacks.
Blasters are used by the maniacal Booster as defense emplacements in his home, Booster Tower. Occasionally, Blasters use the special attack Blazer, which causes the Blaster to shoot a golden Bullet Bill rather than the usual black. If the player is hit by one of these golden bullets, the victim faints immediately. Alley Rats could often be found manning Blasters on the Sunken Ship as well.
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