Double feeds happen. Learn from NSSF's Mark Thomas and Gunsite instructor Bob Whaley how to clear your AR-15 and get it ready for action when it happens to you. (NSSF Video)
Recommended Tactical Rifle Resources
Gun Digest Book of The Tactical Rifle
Gun Digest Buyer's Guide to Tactical Rifles
Own the Night: Selection and Use of Tactical Lights and Laser Sights
Some good info – however instead of performing a push-pull, why not just cant the firearm so you can see the ejection port & see what the problem is, then apply the appropriate steps? That would save some time. Other than that its good.