I don't like how it can shoot out of the reticule...
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Felt like a real gun in Halo 1. I don't like any of the sounds in H1:Anniversary and the 32 round variation made multiplayer a nightmare in H3 and H:Reach. And all Halo's have bloom on some of their weapons, as small and insignificant as it may be. The difference between them and Reach is that in all other Halos, it punished you for spamming the trigger. In Reach it punished you almost for just shooting altogether.