I think it's the same with firearms.
For instance, it seems like almost everyone has a Ruger 10/22, whether they are a levergunner, bolt-action guy, bench-shooter, big-game hunter, trap-shooter, or whatever.
It seems that there are some guns almost everyone has:
- Rimfires: Ruger 10/22, Ruger Mk-I or Mk-II pistol
Handguns: doesn't everyone have a 1911...?
Rifles: everyone has either a Marlin 336 or Winchester 94, don't they...?
I don't like internet "surveys" about who has what guns, but I'd bet if everyone on this forum were to list their firearms (please don't!), there would be some that maybe 50% of us own, or maybe 75% of us, even. Of course on THIS forum, it would be likelier that some of the leverguns would be the common-denominator, but I wouldn't be surprised if the commonest-owned firearm among us might be something like the Ruger 10/22, or even an AR-15!