Your google-fu is weak. Stripped means just the receiver: none of the parts in it. It will cost $100+. That AAC 300 upper costs probably $600+, because it has all those parts including the barrel. Unless you are making a permanent change from 556 to 300 (not recommended), don't swap barrels.
Leave your 556 upper alone and buy another barreled upper...one with a 300 barrel in it. Don't swap BCGs back and forth or anything crazy. If you have the bones to ramp up to another caliber, do it right. But yes, you can leave your complete lower receiver intact, and simply switch that, depending on which upper you are using.
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