I've got the ES model as well as four other 500's. Come to think of it, three of them are discontinued too.

Despite their claim I doubt magnaporting will have any effect on the beast at all, the barrel is simply too short.You certainly aren't going to get quad porting on that short barrel with the barrel nut involved. And as short at it is, even single porting will end up in the middle of the barrel trying to avoid it.

But, if it were done though it might make for an interesting light show at dusk with all of the burning powder coming out of those vents. You'll not only be deaf but blind!