>pinky hanging off
>what about the AR's platform
Depends on what application you want to do with it.
close/med/long range. You can always do a hybrid build, but the mag adaptability might be a turnoff. Avoid the armalite platform if you wish for a folding butt. The 7.62 based kalash remains by far the best engine for close/mid. But as soon you want to be effective at a range over 100m, I would suggest 5.56 or 51 if you're sold on the 7.62 mass.
Or if you want to increase maximum flat shooting, you can always reduce payload weight.