Try leaving your rifle grungy, I don't mean dented or nicked up, after a day of humping about eighty pounds around, up, and down mountains, in the middle of a typhoon, and in the fading light, bone tired, and knuckles swollen and sore with jungle rot, knowing there are people out there who want to kill you, for real, not pretend. You'll clean it, and not because you read a book.