IMO there is almost nothing that isn't worth citing and explaining, even if it's "common sense" or "common knowledge"
But especially something like this. I can't say I don't enjoy chatting with gun store employees, I like collecting opinions, but I try not to settle on one until I know there's something solid behind it. I've actually been guilty of repeating things told me by a police officer that turned out to not be true. Some people on this forum actually helped influence me to stop doing that.