I believe that LAR makes the following lowers:
Noveske, Bushmaster, Ameetech, DPMS, CMMG, Double Star, Fulton
Often times, larger manufacturers will have lowers made from several places in order to keep up with demand.
C4
Printable View
Odd, I got a couple of Noveske lowers last week (direct from Noveske) and they were the Stag manufactured version.
I have to say, they are as nice a lower as I've seen, and a whole lot nicer than they need to be. I actually prefer Stag's version of the markings, not that it really matters.