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You'll have a lot of fun assembling the lower and gain confidence in your knowledge about the rifle in the process.

Depending on the instructions you're following, when they mention "...use tape to avoid nicks/scratches..." it's a good idea. I use painters tape to mask key parts of the lower with great results - and no residue.

And a 2 cent tip, if you don't have a pivot pin detent tool, a small icing/frosting knife works great for holding the detent down while you slip the pin in.