An important consideration when using a long gun is the optic you use. Rob Pincus discusses the advantages and disadvantages of various optics on long guns. A Personal Defense Network (PDN) original video.
Rob Pincus reviews the key components to a efficient reload from bolt-lock with an AR type defensive rifle. Keeping the rifle in the ready position means that it will be easier to get the gun back into a shooting position, if necessary, when your reload is complete.
Student alert! If your defensive firearms instructor is not giving you an integrated system of firearm manipulation techniques but rather a set of unconnected techniques that don't integrate well together, don't reinforce each other, and don't contribute to your efficiency by being consistent with one another, you need to challenge those techniques.