5150 Star Marine?

[Mako]

Thinking this might be a reasonable option for rules for Moongrunt.

Stargrunt II has been suggested too.

I have the latter.

Anyone have Star Marine, or used them for off-planet battles?

I'd like your opinion of the rules. I'm especially interested in rules for games in a vacuum, or toxic environment.

[Metternich]

And there is always Xenos Rampant (which does have rules for vacuum or toxic environment).  I am a big fan of Stargrunt II