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I have thought about doing this, albeit I have 5-6 non-firearm projects to
preform before attempting to go to blackout.
PS: Don’t I need to fill out a ATF form before I do this?
No, you do not need to fill out an ATF form to build an upper receiver. However, you need to check your state laws to see if you live in a free state, or a are in a commie state like New York, New Jersey, Kalifornia, etc., to see if they allow these scary black rifles at all.
The only item that you need to fill out an ATF form on is the stripped lower receiver, which was the subject of a previous post.