I once had an SSK 375 JDJ that was fluted like that, all the way to the end of the barrel. It's a little "different" than traditional flutting where the barrel is back to full diameter at the chamber and muzzle. It took me a while to get used to the "sprocket" look at the muzzle. Still, a neat looking gun, and it would be fun to take a crack at making the wood shine again.
Craig