HPA (High Pressure Air) Gel Blasters have optimum trigger responsiveness, rate of fire and power. They get their power from air sent from internal compression springs. As a result, the increased air pressure causes the flow to increase and trigger a faster fire rate. Instead of depending on motors and pistons to compress air in the gearbox, HPA uses a single air supply that is fixed. Compressed air comes into the blaster through the HPA engine, which allows the airflow to be controlled for adjustable rate of fire and to propel the gels out of the barrel.
HPA blasters are more reliable than a traditional AEG blaster, are easier to maintain and cost less for consumables - all reasons why competitive players choose HPA over traditional electric blasters.