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As stated just about any lower will work fine. Since it is for a juvenile I'd suggest a collapsible stock (a basic M4 stock works great but there are lots of other options out there) and a stock fire control group. At the ranges you will be shooting deer with a Whisper you don't need a match trigger unless that is just something you want.
I only have 1 300/221 barrel, a Noveske. They make very good barrels and I'm happy with mine. Just make sure the gas port is in the pistol position so it will cycle subsonics and everything else is just standard AR. Other than SSK I'm not sure who makes complete uppers but if you haven't built an AR before you should try it, they are an easy platform to get into.
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