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Polarstar has long been considered the best option for high-pressure air systems for airsoft rifles, creating the famous Fusion Engine and, more recently, their F2 or Jack systems which can power wide ranges of rifles, LMGs, or SMGs with reliable high-pressure air supplied by an air tank. In addition, their designs are incredibly reliable, with few moving parts that can operate for a long time with little to no maintenance. As Polarstar has decades of experience, its engines are known to be highly efficient. They deliver incredibly high fire rates while staying within just a few FPS from shot to shot, making them the perfect base for a CQB powerhouse or a powerful long-range marksman rifle, all from one versatile engine.