There are a lot of "Navy" barrels floating around right now. I know of two dealers that have them for sale. I have purchased one from each and they are legit barrels but I am not sure where they came from. The first one I bought came "new" in the cardboard tube, with caps and VCI tube installed. This dealer told me that they came from San Diego and that he had a "box" of them. My guess is they did not meet the stringent requirements for the Navy team and were sent to Camp Elliot to be used in training rifles. Who knows where they have been since then. The second dealer had about 10 or so an I was able to look through them all. At first I thought they were take-offs and most were in poor condition. Most of the chambers had a significant amount of rust and all of them had at least some rust on the surface of the barrel. I took a chance on the best one he had, only some minor surface rust on exterior. This one also had the end caps and VCI tube installed. I have gauged this one and it has a groove diameter of .3075 wich would have met the Navy requirements for a team gun. I have no idea where these have been or where they came from. It is a shame that they were in such poor condition.
I have also seen a fake Navy barrel recently. I believe it may have been a commercial barrel that was stamped to look like a navy barrel. However, it was pretty obvious that it was fake.