There is a picture of gun on the puzzle, it is certainly one given in conditions of puzzle, pretty sure it has automatic firearm mode, mby it is come kind of clue?
But most firearms of that type are not exclusively automatic. Generally they will have a semi-automatic/single shot fire mode as well.

Like a lot of puzzles, there will always be room for interpretation unless the puzzle is relatively simple and straightforward. However, in my opinion, it would make sense to take the simplest view, unless the puzzle stipulates otherwise, to avoid unnecessarily complicating things. eg. postulating about shatter proof glass etc.
Check out our new puzzles! I am sure the last one will be a hard nut even for you =)