A couple of comments based on the last time I went on a tour (2012).
You'll notice that there is no photo of the final assembly area. It's not only fenced off, but it has green sheeting on the fence you can't even look in. They told us it was an AFT rule post 9/11. I remember that when I went back in 1980 or so the area was fenced off, but you could look in.
Also, sometime in 2010 or 2011 they changed how the final assembly is done. It used to be that a fitter put all of the components together and was responsible for building the gun. Now, it's an assembly line, with each fitter putting on a small number of parts then passing the gun on to the next person.
They pretty much stopped doing tours, at least group tours, in 2012. They still seem to do tours for individuals now and then.
They've also stopped allowing customers to drop guns off at the guard shack for repair. Which used to be very convenient.