Such as the following:
Walking Cache: Allows you to pick up ammo in weapons on the ground.
Trigger Happy: Doubles your rate of fire.
Blindfire: When shooting enemies from the front, produces an opaque patch on their visor.
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Tartan, I hope you're trolling. In all honesty, these are terrible Armor Mods. Armor Mods should only affect players outside of combat, changing their combat readiness.