I'm looking to buy a complete upper and swap it out. I have a Colt AR-15 that has the carry handle, so I want to be able to mount an optic on top and with the carry handle, it's a problem due to the ridiculous height, even if I put a picatinny rail on top of it.
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If I buy a complete upper, does it have everything I need installed on it out of the box, or do I need to install the bolt carrier, the charging handle etc? I have no idea how to do that.
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Is it simple enough that I can take it down and swap the upper by myself or do I need to take it to a gunsmith?
You should be able to do this blindfolded. You may have to one day. Practice.