Ian was 2 years and 8 or 9 months before he started gun play. Before, he would make gun-like objects out of Legos and I would ask him what it was and he would say,"A Tower." Then, all of a sudden, he started pretending everything was a gun. It happened a lot later than I thought it would considering we live near and work on an Army base and my dad is a big hunter and we lived with my parents for a good chunk of time during Ian's first 2.5 years.
Eva on the other hand, is already "shooting" at 15 months. Ugh!
You can even see that she is making shooting noises.