I'm a firm believer that the mounts are the weak point. I have a couple Primary Arms and Holosun optics on various rifles, any issue of losing zero has been fixed by replacing the factory mounts with quality ones.
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I ended up ordering two ADM AD-68 Standard mounts. First one, and then a second a couple weeks later. One is on my SBR and the other, well I ended up getting an AD-68L “low” mount in an AD-68 Standard box so Optics Planet will hopefully get the exchange for the right item processed quickly.
The Scalarworks mounts look nice but are a bit pricey considering I needed two mounts because I wanted to dump both QRP-2s.