I love to trade. You wanna know true Kalash sickness... owning a mag for a rifle you don’t even own yet much less one in that caliber.
I bought weiger 223 mags 3X before owning a sar3 or AKs in223/556
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Shit, that's nothing.
Back when I was ACTIVELY collecting Aluminum-framed 9mm pistols, I'd even buy the steel variant if I couldn't find the lightweight version. But I typically had a few mags, grips, and even small parts for the gun before I found it. And then I'd find another, and get it to upgrade the collection...I still have BOXES of mags that I never did get the guns to go with them. Same thing with holsters.
At one point I was going to make a .223 rifle out of a Thompson Center that I got in 9mm (10" octagonal barrel, it's a real hoot to shoot!), and I never finished that project.
I did, however, get a Sphinx AT-84 that was complete except is was missing a BARREL. Found a barrel, made it fit, got it working.
Just one of dozens of things like that I've enjoyed fixing up!