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So how did you get on? Did you make the right decision?
Devon and Cornwall Inspector of firearms Colin Washburn says it's a decision he has to make everyday.
So did you get it right?
Sometimes the only way to find out is by the weight and feel of a gun.
Gun number three is a plastic FAKE gun the kind you could buy in a model shop until the law was changed.
Here's another quick quiz for YOU.
Two photos of a rifle, it's a simple 50/50 decision one is real and one is fake - but which one?
Did you get it right?
Gun B is the real one.