Steel Rain is a free set of generic wargaming rules for sci-fi armor battles. Specifically written these for use with 1/285, 1/300, and 6mm miniatures (these terms are basically synonymous), such as GHQ’s excellent line of Micro Armor miniatures, Brigade Models’ line of Iron Cow miniatures, or Ground Zero Games’ Dirtside/Future Wars models.
These rules are basic, covering most aspects of warfare encountered in company-level engagements. Designed to support company to battalion/task force sized engagements.
Also includes a set of vehicle creation rules that are pretty straight forward.
Envisioned using on a terrain table, not a hex map. That’s why all values are given in centimeters instead of hexes. If you want to increase the scale, use inches; the values will still translate. Or, you can use a hex map and just translate all values into hexes. It’s flexible.
summary from publisher's website