It kind of gives me the creeps, but one of our characters owns this. From what you know, who do you think that it might be? Who might be the least likely to carry it... if that is even a logical question?
And if you were to add this gun as a prop in one of your stories, just how much do you know about it? How much research would you have to do? To make it a little easier, as I know nothing about guns, I might choose one to appear in all of my stories and find out as much as possible about that particular style of gun.