Even if you don't regularly carry guns I find it important as a martial artist to be familiar with guns, the different types of guns, and how they function. The reason for this is that so you know how to defend against guns. Lots of martial arts schools do teach gun defenses using practice guns and there are articles in martial arts magazines that explain various gun defenses. So even if you don't use guns I find it important to be familiar enough with them to be able to defend against them.