What I am seeing is a sight block for a front sight.

Usually Anschutz barrel rifling is slightly tighter at the front end for a "choke effect", not larger as you are describing.

If you look closely you can see the sight block and the enlarged outer diameter of the barrel in this link, this has been typical of Anschutz for years.

http://www.anschutznorthamerica.com/uploads/1/9/9/7/19975381/2527159.jpg?948

drover

223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.

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