[wterrell]

It would be more diplomatic to bring the gun owner to consider whether his gun is in ordnung through questions rather of statements. Statements are agressive and the owner will become defensive. Questions will disarm the owner with implication of learning. If he does not know that facts of what you are asking, the uncertainty will cause him to go home and research. If you are out to prove how much you know, then you had better carry boxing gloves.