The ERA Tac qd mounts are the best I’ve found QD for returning to zero.
Jason Bainey from EuroOptics did an interesting test on that mount
And the quick change barrel return to zero functionality of an AI and the results
Were very impressive for both rifle and scope mount. After getting one and trying
It, got rid of all my other qds and picked up a few of those. They are not cheap, or lightweight, but come up for sale here regularly in the px for cheaper. If you need a QD mount and need something to return to Zero, I have found nothing better.
Now for changing mount between rifle, depends on the rails, not gonna be qd and return to zero doing that from rifle to rifle. Better off to pic one rifle/chassis with QC barrels and do that. AI and desert tech rifles come to mind.
Or custom built like the WTO switch lug. Shorty, lightweight 308, 6.5 Creed, 7-08, 7SAW, 6 Creed, 243, etc for hunting plinking and a long barrel for comps, LR shooting.