It definitely depends on the situation. I think short term crisis events like earthquakes, floods and other natural disaster events will not significantly increase the demand for guns/ammo. Food/water/comfort items are the gold in these types of scenarios.
On the other hand, events like rampant looting, and long term SHTF will definitely increase the want for guns and ammunition. These are events that directly threaten the safety and security of you and your family, and can be "prevented" with firearms.
"logic dictates that endangered animal species are also the most tasty."