QD mounts like the LT104 or ADM Recon mount will work fine for returning to zero on the same upper but there is a huge difference when switching uppers. Most of the time you will have to adjust the tension on the mounts, all of them. Once you change the tension, you will have to re-sight.
As for light weight, the LT104 weighs 7.1 oz and ADM weighs 8.4 oz. The 3 oz Aero would concern me with a heavy scope mounted in it like the one pictured or especially a SS. Going light weight can be beneficial but cutting weight in the wrong area is not the thing to do.
