What do you guys have the best luck with as far as type of lube for the AR15? I've read where they run better wet, as in oiled. Some say they run better dry. My brother used to be a cop and he would only use powdered graphite on the departments M16's. I have 2 new AR's that I haven't shot yet and want to try them out. I don't want a greasy gun. I'm leaning toward the dry graphite. Any concerns or recommendations?