Maybe in extras a laser add-on for some weapons, micillaneous minor extra parts, such as bigger clips, or some scope-add ons, etc., which can add accuracy (such as more steady aim, less kickback, just more fire focused into one area, more range, etc.) or damage bonuses (small ones, and maybe a few accuracy hits to balance it out but still make it useful)?
You could make those rewards for completing the game in higher difficulties, if it isn't too hard (or possible at all, I don't know if halo can do someone do unlockables or something similar) it'd be cool.
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