You must learn the immediate action to clear a double feed with the AR-15 to get your gun running as quickly as possible.
This is a good drill you must know and practice to build muscle memory so that you can do it instinctively under stress.
If you were engaging targets at a distance this is exactly what you would do for a double feed. If it was closer ranges you might consider a transition drill to your pistol and sort the rifle out after the threat has passed.
The best immediate action drills to keep your guns shooting should come from experts with real world experience and training. This is why it always pays to seek out instructional schools that are staffed by former special operations veterans or police weapons instructors. What they will teach is based on years of hard lessons learned.
Apply the lessons from The Armed Citizen Series and invest in your shooting proficiency.