GLFA was one of the better, but they seem to have quit playing.
Here are a couple of review sights.
https://www.americanfirearms.org/best-458-socom-uppers/
https://www.minutemanreview.com/best-458-socom-uppers/
If this is your 1st. foray into long stroke AR's I would recommend doing a complete upper. That way you're not in piece part fitment hell.
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