Replacement upper is good - Radical Firearms 16 in. 300 AAC Blackout Upper Assembly

First upper was out of spec, replacement upper is good. It is however so close to spec at the bottom of the rounds chamber, that a in spec round of .374" at the base will be a tight squeeze that will bind a bit. I bought another die that sizes to .373 at the base to avoid this. I have not yet tested the accuracy out of this upper, only one no-optics, eye down the barrel shot for both testing and the ejection of a somewhat bound case that I didn't want to tear my finger up pulling out with the charging handle.