Combine weapons and LEGO and you can make yourself quite an awesome replica of a LEGO M249 Para gun. This gun doesn’t fire rounds of real bullets, only rubber bands.
Although I should imagine that would possibly hurt a little. This impressive gun was constructed by You Tube user PrototypeNo97 and I should imagine it takes some time to create an arsenal of weapons, but somehow he manages to pull it off. It doesn’t seem to take him very long to piece it together either, you have to be a major LEGO builder to create anything as impressive as this. These aren’t the only weapons he has created as his made a LEGO semi-automatic too.