adventures Aitutaki AR blog box-fed Cook Islands defense detachable-magazine gamma-ray spectrometry Geiger counter GMC 600+ guns history hunting indigenous mapping music nuclear open source outdoors Pacific Ocean paradise Polynesia Pulsar R400 radiation detector radionuclide identification review semi-auto shooting SLK tactical thermal scope Thermion 2 tour travel tropical UAP UFO UFOs Web-Tac Webley & Scott WTS1204BR XP50 XQ50