
Steel Gunner 2 © 1992 Namco.

The majority of cabinets for this game were released as conversion kits for Taito's "Operation Thunderbolt".
Namco System 2 hardware
Game ID : SNS
Main CPU : (2x) Motorola 68000 (@ 12.288 Mhz), M6809 (@ 3.072 Mhz), HD63705 (@ 2.048 Mhz)
Sound Chips : C140 (@ 21.39 Khz), YM2151 (@ 3.57958 Mhz)
Players : 2
Control : lightgun
Buttons : 2

Steel Gunner 2 was Released in March 1992 in Japan (even if the title screen says 1990, 1991 NAMCO LTD.).
Victor Entertainment released a limited-edition soundtrack album for this game (Namco Video Game Graffiti Vol. 9 - VICL-8089) on 22/09/1993.