Holy crap, that's a good idea... I can't believe I didn't think of it, it's so simple. :blink:
Now I'm going to have to go buy that damn Reaction Block. You now owe me however much I will have to spend on it. ;)
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I say loosen castle nut, straighten receiver extension, retighten, and stake on a different notch in the castle nut. Otherwise, leave as is. I have a few ARs that aren't perfect with regards to this and I have never noticed while actually shooting.
Throw that BCM end plate on the pay it forward thread. Somebody can use it because odds are the notches will be in different places.
There's a reason the D in OCD stands for disorder.
You guys can do what you want but I don't reuse end plates or gas keys.
That kind of behavior reeks of a shade tree/hack/YouTuber gunsmith... I see this often on TOS.