Some years ago I acquired a new old stock Remington 03a3 barrel. The barrel is marked R A with 9 43. It is a two grove barrel shiny inside and straight as far as i can tell. The under side has two small x's (xx) located about half way up. I have three other 03a3 rifles with Remington barrels one 4 grove and the others are two grove. Does anyone know what these markings mean or have them on other 03a3 barrels. The barrel is heavily parkerized.