GREAT Pictures! My bolt is from my CMMG 9mm upper and it is just like the first picture (unramped). Meanwhile since the initial posting of this thread I have learned just what has been said here, that it will provide reliability AND longer life of parts (of which I am particularly concerned about the lower being the serialized part and somewhat a pain to get).
My 9mm carbine is a "parts gun" (GT/Danny's stripped lower, RRA parts kit from Pete, 9mm hammer, KNS pins, Vltor stock, Hogue grip, CMMG complete upper), so the warrantee is not an issue to me (what warrantee, we don't need no stinking warrantee!). By the way KUDOS to all these great shops for great parts at good prices and good service to this internet commando...
I do see your point on a Carbine purchaded as a complete rifle, but how long is it Warranteed for, 1 year? (I don't know). I say run it stock until you are convinced it is fully functional (say a few hundred rounds). If you notice any problems get it taken care of RIGHT AWAY. When it come back test it again, then assuming the problems are gone ramp the bolt and put in the KNS anti-rotation stainless steel pins to protect that lower for a good long time. That is my plan only I will only shoot it perhaps 100 rounds before ramping my bolt.
About Warrantees: Oval shaped hammer holes will probably not be concidered a manufacturing flaw and thus not covered until the carbine just won't run. And you may or may not have to replace the stock hammer pin at 500 or so rounds, but to me hoping the carbine does not break is a lack of confidence that I cannot tollerate. You can shoot it until it fails and it may never fail if you shoot a magazine full of ammo every year! But if the pin breaks a couple times and then you notice the hole(s) are sloppy and "ovalled out" you can buy the oversized pins and have the hole reamed (more $). For me I plan to shoot this 9mm carbine a lot, let my kids and buddies shoot it too while 223 ammo is expensive. I don't want take a shortcut for reliability so I will have it ramped before round 200 goes down the tube.
Thanks again for the replies and the very illustrative photos!