I just purchased my first military rifle. It is a Hungarian M44 made in 1954. It does not have the same nuber on receiver and bolt. It acturally has two different #'s on bolt, one which has been crossed out. The barrel looks like it has good rifling, but it is very dirty. The pathces are coming out all black without any other color. What is the best way to clean out the barrel? Is there anything I need to do before I shoot it? I would also appreciate information on what the rifle is worth. Stock has dings and scratches, but nothing serious. Barrel bluing is only gone near the muzzle.