Given the weight of the X-Sight, I was extremely skeptical it would work. It's been on/off 10+ times, POI hasn't moved. Just my experience...
M&P-10+AAC Cyclone - Kel-Tec RFB+Griffin Sportsman Ultra Light 300
ATN OTS 336-70mm 60hz Thermal Monocular
ATN OTS 336-30mm 9hz Thermal Monocular
ATN NVM14 NV Monocular