Do what you like. Different strokes for different folks
I have found lapping the face of the receiver has several benefits and no detrimental effects. Sure you could do it better with a lathe but do you really need to.
Then I glue my barrel extensions in with blue locktite. Does make a difference.
Many upper builders follow the same procedures and build some accurate AR's
If you were building a cheap SHTF gun doesn't really matter but if you want an MOA gun every little bit helps



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