So I got those Halo Mega-blok 4-pack figures and I have to say - they're pretty cool except that they lack the one-articulation point that would have made them perfect (considering all of them hold guns) and that is arm rotation below the shoulder joint. Because it lacks this joint you can't make some figures hold a rifle with both hands in very cool poses.

I got the Arctic Camo set, the original green set and the turret with 3 Master Chiefs (turret pack was only $12, but was missing the spinner piece but that was replaced using lego! )