Recipes for sub machine gun...

[SillyAssBlack]

Hypothetically, what cake/baked goods would be best to smuggle a machine gun into a prison?
TIA

Would have to be something large enough to fit the gun and disgusting enough for the warders not to want to nibble a bit on the way through..... I'm thinking there must be something in the Ginsters range....

A machine gun is quite big, isn't it? Would buttercream damage the workings?

What about a cunning double bluff - making a cake in the shape of a sub machine gun as a thoughtful anniversary surprise for Johnny Fingers, or similar? Or have I seen one episode too many of Ace of Cakes?