Springfield uses a two piece barrel that some in the trade have criticized. Actually there are lots of guns with two piece barrels, so it is a "problem" only if it's done wrong. The recoil spring system is, again, GI with a conventional guide and plug.
Here you can see the stainless steel barrel in the Mil-Spec from SA. Note the "loaded indicator" slot in the barrel hood. Chambered cartridges are easy to see. I can live with or without it but it has caused no problems. Initially I had thought that this was a one-piece barrel, but barely visible about midway between the "O" in "Auto" and the end of the chamber area of this barrel you can see the hairline where the two pieces are joined. I have heard of one or two of these barrels coming apart
Whatever you do don’t buy a two-piece barrel and I would recommend replacing the two-piece barrel that comes in the Springfield Armory guns immediately.
I did a quick Google search on SA two piece barrel and got the above, I know it has been talked about on these boards before, I know people on these boards start getting failures to fire and the barrel separates, What I did not know is if the higher dollar SA models also use the 2 piece barrel. The cheaper std. models and loaded models were never in doubt about being 2 piece.