He’s right when he says, size matters, but sometimes there’s not a whole lot of difference.
A .45 is a .45 not a 9mm. or a .380 – but this is just an excuse to post pics.
Note that there’s no bumper-pads on the magazines. On the old one (1943) it looks inappropriate, on the new shiny one it looks like a goddam zit. And this text is even smaller, too – that’s where size really matters, legibility.