Just an idea
Have 3 weapon slots
1. Primary (assault rifle, sniper, smg, pistol, launcher etc)
2. Secondary (assault rifle, sniper, smg, pistol, launcher etc)
3. Melee (sword, knife,( or maybe items like binoculars credit: BlessedSeraph))
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I say 3 slots but I'd construct it differently. Simply have two primary weapons and a choice of your personal side arm.