Ok
So at the moment, certain attachments (muzzle brake, foregrip, etc) offer large advantages for negligible disadvantages, which is problematic for obvious reasons,

So, what came to mind was: what happened to the C2 system of mobility? (Where each gun had mobility stat and adding attachments lowered that stat) I think that this mechanic could really kind of put a damper on, say maneuverability + fully decked out assault rifle type loadouts and bring them back to reasonability.

Some of the attachments do affect the weight marginally, and the switching speed somewhat almost noticeably.