The barrel is of the Wilson/Nowlin ramped variety.
You'll hear folks call a ramped barrel a "fully supported barrel," and you'll see them seek it out for a 10mm because Delta Elites didn't have enough head support to allow for massively overcharging 10mm loads.
The reality is that ramped barrels vary in how much they support the case (the fabled Glock .40 kabooms were ramped barrels, after all). And if they did "fully support" the case, the pistols wouldn't feed.
After making the rounds for a 10mm and watching counter clerks abuse the used 1911's in their charge, I decided to grab a good deal on a factory-fresh one. The Springfield Armory Ronin 10mm didn't quite match up to the specs I had in mind, but it was the closest on the new market shy of sending...
www.thehighroad.org
i do not know if it was a member there, or he got it from a gun testing site...???