Fire Control Units cover the concept of an electronic device inside your Airsoft Gun that serves to regulate and control its firing patterns. These devices can read a great deal of data and vary greatly depending on the model. These HPA (High-Pressure Air) Fire Control Units are specifically designed to work with and supplement HPA Airsoft Guns and gear. They also come with a high degree of customizability. Just Airsoft Guns is the largest online store in our field — if you need to know more, feel free to contact any of our expert staff via this website with any inquiries.