3D printed GoPro mount for PVS-21 NVG MOUNT. BE CAREFUL this is only a camera adapter for (https://www.cgtrader.com/3d-print-models/hobby-diy/other/p-v-s-21-nvg-mount-sts-sas-uksf-sbs-nvg). Fastening to the base was supposed to be screws, but you are free to modify it yourself as you wish.