Bumper Rules

[IronicDeadBird]

Sorry bEdhEd for running another bumper thread but from my interpretation of the rules, isn't it completely legal to deploy a harder mechanism outside of your bumpers as long as they are clear. Which is to say literally that you could have a riot shield inside your robot and have it extend outside to cover your bumpers. I might just be paranoid and I know riot shields aren't like the most dangerous thing, but if the purpose of bumpers is to make things as safe as possible shouldn't this not be a thing? This essentially provides the ability to nullify whatever you have for bumpers and use any other materials in exchange.
Sorry if I am wording this horribly, and if you need clarification please ask.