fallout ranger wrote:AR15=rifle, so AR15-stock=Pistol?
Negative, Ghost Rider. Pistol by definition is a weapon that is DESIGNED to be held and operated with one hand. An AR that just happens to lack a stock does not make it a pistol. It just makes it a rifle without a stock.
And a glock with a stock counts as an SBR.
Sticking feathers up your butt does not make you a chicken. Just because you add a stock to a pistol does not make it a battle rifle. It's just a pistol with a stock, similar to your example above. Glocks weren't designed to be fired from the shoulder, just as an AR-15 was not designed to be fired with one hand. Modifying one to fit into the other doesn't simply change what one is, otherwise every designation for a weapon is slang as per your apperent definition as with enough time and money, almost any handheld weapon can be modified to a point that someone would go "HEY, IT'S ACTUALLY X."
Seems like a pretty loose term, pistol, basically means any firearm without a stock, not a definite form, action type, caliber, barrel length, rate of fire....Same thing applies to the cannon thing, broad, loose, general.
That's why it's a weapon classification. It's like saying "Naval Ship" is slang because it covers a large variety of types of ships based both on purpose and tonnage. Same applies for "Airplane." Every thing you mentioned in there is covered by subtypes of pistols.
But that's not the point and this brings us back to our original topic, which wasn't about cannons, but autocannons. Autocannon is specifically enough identified as being an automatic weapon that fires shells as oppossed to bullets. 20mm is considered the point where projectiles stop being bullets and start being shells.