I now have 4 ARs, and enough odds and ends to be half way to another. Two are 1:9", two are 1:7". I see benefits to each, but I keep thinking that the 1:8" is probably the most versatile for both myself and many (if not most) other owners. I shoot mostly 55, 62, and 64gr ammo. I also have a healthy dose of 45-50, as well as a bunch of 69 and 75gr match ammo. All of my rifles can produce acceptable results with most (if not all) of my ammo. But it sure seems that 1:8" would sort of be the "ideal, right in my wheelhouse" twist rate for most of the rounds I shoot and stock. As I stumble further into the BRD abyss, I keep asking myself the same question...why aren't there not more sub-18" barreled AR's available with a 1:8" twist? Like a lighter 16" midlength gun, for example. I know part of the logic is that it wouldn't conform to some folks' "milspec" label. I don't much care. The more I learn, the more 1:8" seems the best fit for most peoples' shooting habits. S&W and a few others offer this twist rate, but you really have to hunt 'em down if you want anything other than a SS precision long range setup. WHY?....any thoughts?