I have a question for Gun and Game's collective brainpower. Can an AR10 upper be replaced so the rifle converts to 6.5 Creedmoor (or even 5.56 NATO, though that seems an even further stretch)? I know purpose/context might help, so by explanation this is to step it down so it's not overkill on small game. The AR10/308 Win is fantastic for hunting deer and elk, but I'd like to use the same lower for smaller game/varmints, if that's possible. The current rifle is piston driven, which might make a difference. I'm assuming a complete upper conversion including hand guard, gas block, charging handle, and bolt carrier group would be needed, but really don't know. Anyone done this kind of conversion or have expertise to know whether it's possible? If it is feasible, what kind of changes may be needed for the lower, if any? If not feasible, then so be it, but I'd like to hear your perspective first. Thanks!