What exactly is a Kalifornie lower? As I said, I have been reading on AR15.com and have heard of them, but I have never actually heard the differences. I have just bought another Armalite AR-10 out of Arizona that looks a little different (from the pictures that the seller sent me) from the one that I already have. It may be a Kalifornia lower. I bought this "new"gun for the upper,so the lower will be for sale.