The hobby and historical recounting of firearms throughout history.
To be a firearms enthusiast there is a common denominator amongst this fraternity. WE know what we support. WE know what firearms mean to the cause of freedom.
Gunowners have a culture of their own, little understood by the layman, and never understood by the anti-gunner.
To a sociologist, technically it'd be a subculture. But I personally prefer to reserve that term for those whose interest is in submarines.