Just bought this yesterday and have a few questions for the experts here. Is there a difference between a 1903 Remington and a "modified"? Answer I have seen is not really clear. This gun has some mixture of parts but I will let you folks point those out , good or bad. End of stock has a flaming bomb on it and looks to have 4 inspection marks in front of the trigger guard. Notice the NS bolt in it. Please explain this. Most parts have a R on them. Could not send any more pics as my file upload is full. Let me know what you think as I am new to this 03. Barrel is dated 11-42.