I have several of the Ivey Mounts and like them…
I definitely prefer/require a mount to be rock solid and generally the Ivey’s are but occasionally a round can intermittently wonder under heavy recoil without the discussed modification (this can send one down a rabbit hole to determine why). I’m just pointing out the potentiality of shift without an additional lockdown insurance modification.
To be clear…Without a modification added…With the Ivey locked down and the rifle with bipod resting firmly on the ground…Put your hand on top of the Scope, firmly/smoothly push down and the Scope will push through the spring tension and allow movement to a bottom out past the added MOA/MILS added. For myself, any movement leaves “the potential” (not always), for unwanted/unexpected shift from that movement. Even if the spring was incredibly stiff, you could potentially experience a potential shift in POI.
Totally eliminating that potential is what makes the well made Ivey more solid without question or wondering if it could have been caused by that.
Mounts that are adjustable are inherently difficult to solve POI shift consistency. I hope I’ve explained? I’m in no way trying to badmouth Ivey’s, on the contrary, I really like mine and recommend them. This modification just helps with my confidence that any POI shift is me (as usual) and not the mount.