LOL. First of all Tuna is a salt water fish, so if you ever were to swim with tuna i’d be more concerned about the effect of the salt water on the delicate 1911. I have first hand experience with the the effects even sweat can have on a 1911 if you’re not anal about cleaning it… you get pitting.
Unless were are talking about tuna that some how are on land… which in that case we are all screwed. Your 1911 will definitely be disrespected by some big tuna.
Yet another reason to get a Glock. :P