I wasn't being particularly serious about it either. And anyway, it's an interest and not an obsession. Albeit an interest with some practical applications. For instance, when you meet the inevitable "ex-member of the SAS", who, upon questioning, turns out to know fuck-all either about guns or the army. Even more practical was an episode that happened to me a couple of months ago.
I was stopped late one evening by some gonzo jumping out of a shop doorway pointing a gun at me. The street was well-lit but deserted. His stance was a bit Hollywoodish but OK, but he was holding a Desert Eagle. Now this is a huge pistol produced in .357 Mag, .44 Mag and .50 AE. I happen to own one in .44 Mag (it's in Switzerland). The weapon weighs over four pounds with mag and the way this geezer was holding it, plus the tiny size of the muzzle, told me it was a toy. So I stepped in, grabbed the gun and slugged him in the gob. Result? Maybe he'll think twice about holding people up and my valuables were still intact.
Ideally, there should be no weapons at all in world. But that's a bit utopian and won't prevent you getting shot. It's best to know what you might come up against.
I take it you still don't know who Juba is?
MsG