Faster variants of the Galvanic Accelerator Cannon are seen in the escape from the Frigate Orpheon in a group of Pirates at Biotech Research Area 1. These are normally killed by the explosion from the Parasite Queen tank, but can be knocked away from this and will then turn on Samus with high-speed fire. The Galvanic Accelerator Cannon variant is double barreled, and the pirate's wielding them lack the forearm-mounted scythe, like the other pirates in the frigate.
The handheld Galvanic Accelerator Cannon is no longer used by Pirate Troopers in Metroid Prime 2: Echoes, as the Pirates upgraded their beam systems to Quantum Assault Cannons, a supposedly more efficient weapon. Pirate Commandoes are armed with Pulse Cannons.