Why are Marines noted for their marksmanship? Because they take care of their rifles is the easy answer. What does that entail?
A review of how to clean a rifle is interesting. For instance, how many times have we seen people put a cleaning rod down the muzzle with a brush or cleaning patch on it? And how many times have we cleaned our rifles with hot soapy water? Check out the link to see how, , , and why , , it was done a hundred years ago.