[Accipender]

I personally liked the original idea rather than what this has become. Customizing your weapons would make it even harder to sell, and people are already taking far too long to sell weapons. I pictured them more as belts personally.

As far as the technology goes, it could be like an arm brace or something that releases drugs into your body, temporarily increasing stats, like Steroids for Strength, Cocaine for Dexterity, or Morphine for resistance.