The “secret” to keeping your AR-15 up and running is lubricant and plenty of it. You absolutely should have lubricant on hand whenever you are at the range with your AR. My favorite lubricant is Slip 2000 EWL and the good folks that make it have made it easier than ever to keep their lubricant with you at all times.
Many AR stocks and grips have space to store CR123 batteries so the folks at Slip 2000 designed a bottle that is the same diameter as a CR123 battery. Now you can store your lube right on your rifle. Simple ideas are often the best. This one is so simple that it is genius.