Indeed, this may mean that he has not carried one since World War II, reasoning that if he were caught, he would be able to explain anything he was carrying except a gun. He also believes that guns give their carriers a dangerously false sense of security, and dislikes the noise they make. His resistance to interrogation is exceptional and he has managed to keep the "suffix-nine" designation indicating he is "reliable under torture".
Indeed, this might mean he hasn't carried one since World War II, believing that if caught, he could explain everything except a gun. He also thinks guns give their owners an exaggerated sense of security and finds the noise they make unpleasant. His resistance to interrogation is remarkable, and he has managed to avoid being labeled "suffix-nine," indicating his reliability under torture.