[@Klomster] I'd be fine with a big ass rifle, except I'd largely just have to make it up, as opposed to basing it in fluff... I mean, I could use something that actually exists as a basis, and modify it to be more inline with something from 40k, but by default I wouldn't have any fluff for it.

Personally, I'm looking for an alternative to las tech... mostly because the description of how they work, and the damage they do, just doesn't mesh with the reaction 90% of things in 40k give to it. "Oh, no! Flashlights!... lol!" isn't something you'd expect to hear anyone say about a thing that can cleanly sever a limb with a small explosion.