This looks intriguing - I often wish I could more easily go back between a couple or more exact settings. On a firearm potentially used for protection, I would just set for one ammunition and leave it, but for range use or practice or hunting, it is nice to handle a variety of loads, suppressed and unsuppressed, in the same firearm.
Unfortunately, I think this will be like all the other non-set-screw type adjustable blocks - there will be leakage....how much, and in what direction, and whether or not it becomes an issue, is a whole nuther story....(remember, the Garand, M1A, Mini-14, and AK-47 designs basically leak out ALL the gas up there, and they work just fine
). I'm tempted to try one of these and see. Maybe...
Ford is makes a similar one but I'd expect more gas leak with their design - https://fortismfg.com/gas-block/adjusta ... -block-750