This poll defeated my attempt to answer it. So I didn't vote.
It's not that I couldn't decide, it's that the question itself is miserably, utterly wrong. While I'm as imaginative as the next fellow, I cannot get into the headspace of a person who could ask a question like this.
Weapons are organic things. They are part of your mind and body. You train with them until they are as familiar to you as the sound of your voice and the sight of your face in a mirror. Guns, like swords, are individually unique - each has its own character and personality. As you train, you learn its particular idiosyncrasies and quirks, the things it does well and the spots where extra care is needed.
Any gun, right out of the box, is an unknown quantity. You'd want to clean a semiauto thoroughly and examine each part, oil it and reassemble, check for magazine retention and drop, spring strength, ejection path, and sight accuracy. Eventually, over time, it will become known to you.
Given today's quality of machining and manufacturing tolerances, I would assume any gun off the shelf, NIB, loaded with standard ammo probably would fire and that wouldn't be a particular concern. Same with a sword. Out of the box, I'm sure it would cut things and be capable of wreaking tremendous havoc. But until I "know" a blade through extensive work with it, I don't imbue it with my trust.