Got a tiny gap with the sapphire lense, but not with the stock one. Tested it twice with the different lenses, with same reult. Thats why im guessing there is a tiny differnce between them. o-ring is in place and the pill is torqed in place as hard as i dare. Using the stock lense now, not because of a tiny micro gap, but i like the ar coating on the stock lense. Can't see any ar coating on the sapphire. Love the upgrade, and im 110% happy with the upgrade. But cant help scrutunizing my precious