Gel Ball Undercover presents an HPA-powered Gel Blaster that use the PolarStar Airsoft Jack HPA engine... "Join us as we explore the features and capabilities of the Polarstar Jack M4 Gel Blaster. We'll discuss its advanced pneumatic system, which offers incredible consistency, reliability, and adjustable performance. From its customisable FPS settings to its efficient air compression, we'll break down how this powerhouse of a gel blaster delivers unrivalled accuracy and range on the battlefield."