To clarify, i'm not implying that a carbine course has no value in HD. One with very little experience or exposure certainly could gain large benefit. However, I guess what I wonder is if there is a rapidly diminishing return on investment for one who already has familiarity with the selected carbine and its operation. One doesn't need a carbine course to develop the muscle memory of flicking off the safety switch before firing the gun. In fact, taking a carbine course will not develop such. Rather, repetition will. Also, let's be honest, its not difficult to make center of mass hits at HD distances with a carbine. Might the rounds land 1.5" lower if they don't account for line of sight? Sure, but is such really a big deal when we're talking rifle rounds at close distance? Might the carbine course help them to be a split second faster? The real benefit, as I see it from my admittedly limited perspective, is that a carbine course may help one learn to better operate his carbine under a stressful situation. However, if such stress can not be simulated regularly during practice, will experiencing it for one weekend really translate to a future real world scenario? Again, I have no doubt that a carbine course can make one much better with a carbine. I just don't know that said improvements are likely to ever be the determining factor between prevailing in a HD scenario. How often is it that a person fails in a HD scenario in which he would have otherwise prevailed had he taken a carbine course? A handgun course, on the other hand, seems to have a far greater chance of being a determining factor in one's ability to succeed in a HD scenario. For most people i suspect there is far more room for improvement with the use of a handgun in realistic civilian type self defense scenarios than with a carbine. A handgun course also translates to better defense outside the home. As such, it seems to me that the return on investment of handgun courses greatly outweighs those of carbine courses. I suppose thought that if a person doesn't carry outside the home and will only use a carbine for HD then a carbine course is the better option but even then might a general HD class be better option, at least first?