Im new to the Remington 700 and am unsure as to which model i have. There is a wide range of models and barrels and im not sure which one i have. Its a Remington 700 .243 WIN, it has "xv" on the left side of the barrel which i figured to be the date code DEC 1979. it has REP on the right side of the barrel. Its a full wood stock with the drop plate on the bottom. How do I know which barrel I have and the model? Thanks for any help.