Not a T/C Hawken. It may have begun life as a T/C Renegade. Whether or not it was a factory finished or special offering, I'm sure someone here will know. I have never seen one like it. Especially the two-tone hammer. The stock does not appear to be factory finished but again, Fox River did offerings that were not widely advertised. Is the barrel stamped Hawken? If so, my guess is someone took a 1" T/C Hawken barrel in .54 caliber and mated it to a Renegade stock and furnishings. The front sight also does not appear to be a standard "Partridge" style sight found on the Renegade.
The other possibility, a personally customized and assembled Renegade kit.
If the barrel serial number has a K pre-fix, and you can make out a K in the stock channel, it was a kit rifle.
How was that gray/silver like finish applied?