I've taken to dumping suspicious stuff in a lake.
I had a Mk48 the other night, and with the duping debacle, I took the decision to ditch it too. There's two separate considerations at play here. The first consideration is the rules established by Rocket about what's bannable and what's not.
The second is the risk of being banned by TOG for using duped items, or ammo duping. I'd argue the point that we're play testing an alpha and so this shouldn't be a real issue, but from what I've heard, the reality is very different.