A PCP air rifle is a type of air rifle that uses compressed air as its power source. PCP stands for "Pre-Charged Pneumatics," which means that the gun is filled with air before it is fired. Unlike traditional air rifles that use a spring to create air pressure, PCP air rifles use built-in air tanks to store compressed air, which is then used as the propellant to fire slugs. These air tanks are either built into the gun itself or will screw on to the rifle, and they can be filled with a hand pump, a scuba tank, or a small compressor. PCP air rifles are known for their power and accuracy, and they are often used for hunting and competition shooting. They are also quieter and have less recoil than traditional air rifles. PCP air rifles are easy to shoot accurately, making them a popular choice for beginners.