I want to play a game set in the WH40k universe, where we play as Space Marines. Too bad that DEATHWATCH and WH40k for d20 are too rules-heavy and my players won't read that. It must be really lite: less than 40 pages.
Also I'd like a system with a highly lethal combat system and I'd prefer a system that encourages storytelling and description rather than a system that is just "hack n slash". What system can I use?