This is exactly what I want.
I have one of the M10M uppers (mid-length gas, rifle length sights). It is by far my favorite rifle to shoot. I absolutely love it.
Only problem is, its too f-ing heavy. So I have been debating right now whether or not to make my next build the mid-length light weight from CMMG.
I only have vision in my right eye due to an injury. This means that irons are best for me (to maximize my FOV). Almost all of my rifles are A2's. The longer sight radius and the fact that the front-sight post takes up less of my FOV with rifle lengths sights really makes all the difference.
I love my 6920 but quite frankly the carbine length sight radius SUCKS!. I'm afraid to jump on the middy (even though I honestly like how they look better then both the dissy and carbine with 16 inch barrels), because i will have the same problem with short sight radius causing the front-sight post to take up more of my FOV then I would like.
I really wish I could find a complete upper - lightweight dissy (preferably with mid-length gas, though that is secondary) with M-4 feed-ramps, MP tested quality bolt, 4150 steel, chrome bore and chamber, F-FSB, etc. Unfortunately it appears that there are currently none to be had.