I ordered the NDS lower and also wanted to get it "Battlefield Pickup buffed"
I sent them the upper from my kit so they could match the lower and they called me to confirm that I wanted the upper buffed. I asked why and he told me that it was one of the nicest original uppers that he had seen and he hated to polish it down to bare metal in some spots. He made me a great deal on a blem upper matched to my lower and the pristine orig. upper is setting in my safe.
As far a barrels, mine came with a colt pencil type barrel that was already parked and the front sight/gas block was installed.
you might want to check out www.retroblackrifle.com for lots of specific info on your make and model.