I'm going with the Halo one assault rifle (ma5b) even though I like the new one for better accuracy and it can be used like a battle rifle too if you shoot it in burst. I love how it reloads much faster, but the MA5B seems to have more damage, and the way how the gun shoot sounds freakin' awesome. The only thing I hate is the reload time (wtf were they thinking?!) and it's not the most accurate weapon in the world and compared to MA5C's accuracy, it's trash. But it's much more satisfying to shoot grunts, jackals, or elites right upclose with the MA5B compared to the MA5C. Also I think the MA5B uses hollow tips so it goes through to targets.

The Halo 3 AR is a lot better, and no it doesnt even compete with the AR in terms of accuracy. But still an awesome weapon to use.

Halo 3

Halo 1 AR sounds better when you shoot it. Halo 3 AR sounds too much like the SMG.

MA5C Assault Rifle (HALO 3 AR) all day

I can't decide. They are both so good.

Halo 3 i guess.