H & K Tactical Barrel specs

[M60ACE]

I am curious if anyone can help me with 2 questions about the barrel used in the H & K tactical USP .45
 First off, does the barrel fully support the cartridge? Second of all, the barrel's interior looks to be chrome lined, I am wondering if it actually might be?
Any help would be greatly appreciated.
Best of Regards, Todd

[williamlayton]

I have been hoping to hear a reply of your questions also.
My first thought--just me think--is that it is not a fully supported barrel. Butlerford has experience witht the H&K and I was hoping for a response from him.
Chrome lined barrels would not be out of the question. H&K is a maker of good military weaponry and chrome in the chamber is a good indication of this but I am not sure of the barrel.
Blessings