Does recognising parts count as knowing? XD Him and his friends are quite interested in firearms and associated tech. It's quite entertaining listening to their in depth discussions like they know what they're talking about.

_{one time when we were roleplaying and they were discussing ballistics something or other and I was like okay then you better be telling me the truth coz you could tell me almost anything and I'll believe you, and on very rare occasions threatened with I WILL CHECK WITH GALEN XD}