750 (Multitrack)
90, black with bright green, also intense blue with white
91, black with white decals on yellow and silver
92, white with red decals
93, lunar to black fade with white decals
94, ice violet to ice indigo fade with white decals
95, ice indigo with silver decals
96, ice black with white decals
97, gloss ice inkwell blue with silver decals

The above is from the vintage Trek website. Gunmetal Gray doesn't jump out at me. You can go to the catalogs and see if you can find the color and component match.

The Trek Multi Track bikes appear to have a lot going for them. If it fits and you like it, I'd buy it. Good one to learn wrenching on if you need.