How do they tally Thompson Contender and Encore barrels? You can get almost any caliber and barrel length to shoot on those two frames. In France the barrel is considered to be the firearm and therefore requires a handgun permit to own.
Practically everyone has more than one barrel. My favorite in my 40+ collection is a 5 inch chambered in .50-70 to launch a 750 grain .50 BMG slug.
I’ve been to Finland a bunch of times and ownership of automatic weapons is encouraged there. Sako and Valmet make the highest quality version of the AK-47.
I'd venture to guess that you are not in doubt about whether that particular shell actually fired, vs. the possibility of a dud.
So, the Finns (with one of the highest alcoholism rates on Earth) can be trusted with full autos, but we proles here in the US aren't allowed to buy any post-'86 ones and must pay multiple thousands for any earlier models, if they can even be owned in our state? WTF??? So much for freedom.
Repeal Title 18, Section 922(o)!!!