To my knowledge, Tennessee Guns was the importer of all the rifles both AIM and Centerfire are selling (Enfields of course). There were 3,000 or so.
As to the origins? They are ALL from Northern India, and have been Indian FTR'd at Ishapore. ALL of them. Some are directly RFI (Rifle Factory Ishapore) built (No1mkIII's), some are Brit, Canadian or Lithgow Aussie made but rebuilt in India. This should have been made VERY clear by both companies, which is disappointing it was not, but that's the way it goes.
To find out the origins of No4 rifles, you usually need to research the serial numbers to find out the maker. Stratton sells a nice book for that.
The finish on the No4's is the way it is probably because the guns were power-washed either prior to shipment or here at the importer (where is anyone's guess). Notice all the No4's have evenly worn finish, not just in the wear areas? Also, some scrubbing marks are evident. The Indians slathered these guns with black paint, and likely the power washing took it off. The wood is open grained too, which is also a tip-off. The no1's fared better in this trip and aren't as beat up from the examples I've seen at AIM and on the net.
Not trying to pee in anyone's wheaties, but these guns are a disappointment to us Enfield collectors, but should be serviceable shooters none the less.
The stock is actually in OK with 2 repairs on the butt but the metal is something else. Looks like someone took a grinder to it to remove rust. All the markings are gone from the receiver and someone has electropenciled No 4 Mk I in the side.
The Indians didn't always, but often scrubbed the receivers during their FTR process, destroying alot of inspection marks and Brit markings. Sad, but that's part of the rifle's history. It was probably not done here in the states. Just FYI.