It's not gonna happen, at least not safely. The 12ga is already pushing it in terms of barrel wall thickness. T/C even had to make a special optic mount with short screws for that offering. Maximum barrel diameter for the Encore is 1", and, thus, maximum barrel wall thickness Would be just over 1/10" for a 10ga. Safety issues notwithstanding, there's no way to drill and tap for mount and get enough threads.