I won't be addressing this, frankly, stupid point that has no bearing on the subject at hand.
What worries me is your assumption that I don't know what a gun is. To the contrary, I
very much know what a gun is, but I bet you don't.
In the United States,
this is a gun in the strict legal sense. I'm sure other countries around the world have similar legal definitions.
That's the lower receiver for an AR-15 rifle (Technically a "complete" gun would consist of both the upper and lower receiver... such an assembly could fire a bullet but with absolutely nothing resembling accuracy). That is a weapon that can most certainly be considered a gun.
But you know what would also be a gun under that definition?
This. That's the receiver for a fucking airsoft rifle. That's why we don't just call anything that has a receiver a "gun". Just like all squares are rectangles but not all rectangles are squares, so too to all firearms have receivers, but not all receivers belong to a firearm.
Countries that aren't out of their heads when it comes to guns don't look at an airsoft rifle and think "Yep, that's dangerous... look! It shoots stuff!" and make you manufacture them noticeably smaller than real weapons and forbid you to make them resembling real firearms... and paint them bright colors.
So, my British friend, just because a .22 can fire a projectile with potentially deadly force (again, if you get hit in the head. IIRC a .22 can't even penetrate to the human heart at distance.) does not obligate me to call it a real gun anymore than a CO2 powered BB gun a "gun". Both are capable of killing if you hit someone
just right.
A real weapon worthy of tight regulation (in terms of who could own the gun, not the gun itself) would be one that was dangerous when hit
anywhere.
Again, I can home-make a coilgun with more dangerous specs (both in caliber and muzzle velocity) than a .22.
The things are fucking toys. Stop pretending they're super serious things even when the bullets they fire aren't considered humane for hunting (because they're not directly lethal unless you've got like... SAS accuracy and can hit everything in the eye) and are bolt-action (One round per reload for anyone who doesn't know).