When I look up the 811000 on S&W's site, I see something that appears contradictory. It says it has the Armornite finish, but it also says it has a chrome lined barrel and chamber. I would doubt that they would nitride the barrel, then chrome line it as well. It also says a 1:9 twist, which I believe it would have a 1:7 particularly if it is chrome lined.

I would go with the Sport for a couple of reasons. The Armornite (nitride) treatment is excellent for a semi-auto. I would prefer that over a chrome lined barrel. I also think the barrel profile is preferable on the Sport. Parts are probably the same otherwise throughout.

The only reasons I could see going with the 811000 would be if it does have a 1:7 twist barrel and you want to shoot the heaviest of bullets, 77gr then perhaps you may get better accuracy. The other would be if you prefer the carry handle, but those are available anyways for less than the difference in cost.