Maniek44 recommend the Runcam Scopecam 2 to be the best scopecam with zoom functions for mounting on airsoft guns. The RunCam ScopeCam2 is an upgraded version of the ScopeCam Lite, perfect for capturing HD footage of your target during airsoft games, hunting, or other activities. With a tough, compact, and waterproof aluminum body, it easily attaches to and releases from mounting locations. The camera records at different ranges depending on the lens choice. Just slide the record switch to start filming.