Not to be too picky, but this is almost right just not quite. The barrel is a tube that is shrink fitted into the casting that has the hood, locking lugs, and barrel lug. As the casting cools, it clamps down very hard on the exterior of the barrel, anchoring it. The chamber is cut into the barrel. This is a fairly common method for cheaply made barrel, and much cheaper to manufacture than the "correct" integral barrel and hood as in older Colts and WW2 1911s. We used to see a lot of barrels made this way being sold as "surplus" by Numrich back in the 1980s. Kimber still sells guns with barrels like this.The outer portion in the chamber/barrel hood area is a sleeve that's fitted over the inner portion of the chamber -- the actual chamber -- and then (from what I've read) silver soldered in place.