The Barrel can be ordered for a bit extra from the factory. Just ask for it.
As far as how it compairs to the 10mm... honestly I have no idea. I did not get this gun to be a super power gun, I got it to match my collection. I only own guns in 22, 357 magnum, 45-70 Govt and 12ga (though my wife does not follow these rules) As you can see finding a semiauto handgun in one of those calibers is hard.
Shot placement is everything! I would rather take a round of 50BMG to the foot than a 22short to the base of the skull.
all 26 of my guns are 45/70 govt, 357 mag, 22 or 12 ga... I believe in keeping it simple. Wish my wife did as well...