We're not talking about doing a mag change. We are talking about diagnosing a mag failure, retrieving the new mag from who knows where, dumping the defective mag and inserting the new one. All of this is not in a drill situation where you are prepped to do exactly that but in a situation where you didnt expect to pull your gun to begin with.I disagree with 8 seconds, at east as a general rule. Moving deliberately, I can do a mag change in under 5 seconds. Now, I am obviously not factoring in stress, position, injuries or whatever else, and maybe that's where I am not understanding this point.
And that is 8 seconds with good training. You might as well train to change the extractor on the pistol.