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Another question if i buy these parts online do they get sent to my house or do they have to be shipped to a gun store and then i have to pick them up and get charged a fee?

The only part of an AR15 that is a gun is the lower receiver. Everything but that can be ordered on the internet and sent to your house unless local or state law prohibits that. The lower receiver would have to be sent to an FFL if you order online or you would have to buy locally. When I say lower receiver I mean just that. The parts inside the receiver don't count as the gun just the receiver itself.