The first release labeled Proto 5.0 (5/23/1994) is lacking several speech samples spoken by members of Aerosmith which can be heard after collecting power-ups and has a shorter Pacific Rim level. Revision 1.0 (6/16/1994) restored the missing speech samples and has the complete Pacific Rim level and completed two new crosshairs in P2 and P3. "Revolution X" was released as upright two player and deluxe three player arcade units and as a conversion kit for existing gun games such as "Terminator 2: The Arcade Game".