He's never hidden that he knows his way around a gun. He just...didn't show up with one, that's all.

Sam eyes Robbie for a moment, looking him over before nodding. "All right. I'll trust you to know your limits." Which, if he knew Robbie well, isn't something he'd probably say. But he doesn't and this is where they're at right now.

Besides. He knows it's not the same, but he remembers too well how far around the bend he went when Dean went to Hell.

At the reminder, though, Sam raises an eyebrow before slipping the holster on his belt. Better to use a belt holster than a shoulder. He's a bit too broad for that. "They are. But it's also self-defense. I'm not planning to kill anybody. Just not going to let any of us get killed, either."