The aim of this project is to develop and design a semi-automated sentry gun security system in order to detect, track and shoot the target for surveillance operations. This project is of a sentry gun that will be semi-automatic using an Arduino controller. It is a global issue that everyone wants to protect themselves and their beloved nation from various threats and dangers and keep their surroundings safe. This is a Bluetooth-based targeting gun system as the name suggests, it is based on a digitally controlled gun mechanism. This mechanism is built for good performance in the field with high sum accuracy, self-reloading gun, and ultimately used for soldier’s assistance. The gun mechanism used here is called a sentry gun because it has a gun mounted on a wall or stand and an operator can operate it from a control room via remote. It uses an IP camera to scan the area under surveillance and motion in that area is detected by a PIR sensor. It can definitely perform better in areas where human presence is prohibited. It will bring positive outcomes and reduce the death toll, if installed at every border and law enforcement agency, to stop undesirable & illegal intrusion.