So, last night I DM'ed for the very first time. It went pretty well, which I was very happy about. But, there was one weird thing.

We have a player who is in the military and is very big into guns. And last night, in the middle of the game he pulls out his handgun and begins to take it apart and put it back together again. He does this a couple of times. One of the big problems is that it's distracting how loud it is. But also it's making me and at least one other player, very uncomfortable. He is to my inmediate right and I can't see him doing it over my screen but I can hear it.

I think obviously I have to talk to him. But does anyone have any advice on how to approach this subject?