So I watched SOTARs video on the Larue Upper kit and he was concerned about the Buffer Tube and Castle Nut, being a Level 1 grade, on the example he got.

If this is the case, should I just get a Vltor buffer tube and FCD castle nut? I was also looking at the BCM A5 kit as well.

Rifle will be set up for range shooting under 300 yds for the most part...caliber 5.56

Thanks!