Just buy a lefty. Its not worth messing around building unless you want to be one of those guys telling everyone you built your AR. I don't see the value personally. It won't make you shoot better than the bullseye if you can already hit the bullseye. My stock Stag does that for me.
I picked a Stag 3L for $730. Done. Shoots great. You can always upgrade parts later when you get the bug. They will still fit.
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X_shooter
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