The Hurricane M120 Tune-Up Kit for TM style MP5 is an all inclusive upgrade kit. This is everything you need to bring your gun's FPS to about 400(individual results may vary, professional installation is strongly suggested). The M120 spring is supported by a vented cylinder with very smooth walls to decrease air resistance. The cylinder head is completely made of polymer to decrease the probability of breaking. The spring guide and piston head are fitted with ball bearings that allow the spring to rotate. Also included with this kit are solid metal bushings, these will help keep the gears from stripping. Everything in this kit is designed to increase the FPS of your gun and keep it firing long after the upgrade is installed.
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