New SBR project...Need Help!!!

[wescus]

OK guys,
I need some advice. I want to do a SBR whisper so my grandson (who is now 2 years old) can shoot a deer. The ar is a perfect platform because of the stock and .300 whisper works well. I have an AAC cyclone already. I figure I'll wait long enough for the SBR approval for him to get old enough to hunt with me!! What's the best route to go? Which lower, which upper, who does the best work? I also have an old 'EA' complete lower but I think it's cast not forged?... I'm a bolt gun guy and have a Rem 700 whisper with a 16 inch bbl, but need ideas on an AR gun... I'd like to do it right the first time.