[Kale]

It's a bit like the Trojan Horse: The first one worked great, but the successive ones less so. A weapon disguised like a toy might be ignored or overlooked by authorities initially, but after a couple high-profile murders or assassinations they will be more likely to shoot first and check the 'toy' later. Politics aside, police in some jurisdictions are developing a reputation for opening fire on any individual holding a vaguely gun-shaped object, toy or not. In comparison, in the mythical 1950's kids ran around with cap guns 'shooting' at all sorts of things without raising eyebrows. Your character's mileage with the 'toy' idea will depend on the society around them.