Do a 360 degree exam of the gun. Even though the environment would be radically different, he would find ways to survive by locating food and water under new conditions. Adaptation would be the key to his survival. Those of the lawyer, the doctor, the dock worker, the security guard and so on. When you put on someone else's thinking cap, you will broaden your search capabilities.
Tunnel vision becomes a thing of the past.
We all have the hesitancy to stay out of disciplines where we lack expertise. Remember, however, Shakespeare wrote compelling plays about Italy without ever visiting Venice or Verona. True, he was a genius, but you can also tap the genius within. Lawrence sees nothing. His nearsightedness was not due to some visual defect, but that he was still seeing with his British soldier's eyes.