Remove the Cloaking Device

[Embolism]

Also, if you don't have a gun at all, pick up glass and throw it through magic opening doors. I'm pretty sure glass shards do enough damage that two or three hits will turn off the cloak. If not, maybe this will be a nice thing to change.

Where would you find two or three pieces of glass shards lying about without bashing down a window? Not really something you can do in a hurry, unless you're saying we should start carrying a backpack full of glass shards when someone screams "CLOAKER" over the radio.