Between the military and civilian life I've found that a simple tear down after about 500 rds gets them lapped in nice and good, other than that clean like ya would any other rifle, light coating of oil on the bolt and pins will do ya as well as keeping the powder crust cleaned from the gas tube, personally I have no issue going a little heavier on the oil part, over in the desert with the sand as fine as talcum powder you gotta worry about buildup but here. .....