If the left barrel was opened by a craftsman, there would be no marks. i am inclined to guess this is the case. I really doubt that the makers of Rangers took special orders. however, we have mostly learned to never say never when it comes to old guns. If you are happy with the price and it shoots to your liking, then it is a good gun.
BTW, I can be more helpful with future questions on gun handling if you reference balance (teeter-totter point) point to the (front) trigger. There is no fixed relationship between the hinge pin and the hands as there is between the trigger and the back hand. Balance determines the % of the gun's weight in each hand. If you know the distance from balance to trigger, triger to center of the back hand, and center to center of hand spread, you can easily proportion the weight into each hand. different shooters have different preferences for how the weight is proportioned between their hand, hence, differing preferences for balance.
