I would build it, that way you get a feel for how everything goes together and you will have an easier time maintaining it.
For an upper, depends on what you want. For a basic upper buying a finished one is a bit cheaper since you don't need any tools. First AR I did I bought a premade upper, since then I have gotten the tools(not much, just a barrel nut wrench that matches the barrel nut I used(YHM for me, I like their handguards) and a vise block that will hold the upper in place while tightening things down.
For an upper, depends on what you want. For a basic upper buying a finished one is a bit cheaper since you don't need any tools. First AR I did I bought a premade upper, since then I have gotten the tools(not much, just a barrel nut wrench that matches the barrel nut I used(YHM for me, I like their handguards) and a vise block that will hold the upper in place while tightening things down.
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