Got two ideas for this.
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The player should have a visible ammo icon, not just your teammates. This allows you to make a quicker snap judgment as to who needs to pick up ammo supplies, you can glance at the colour of the bars instead of having to remember a different number for each weapon you use.
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Psyker teammates should not display grenade and ammo bars if they don’t use them. Psykers with staves for instance could display an alternate symbol instead of bullets.