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Features
- Full Tune Up Kit with an SP120 spring for M16 series of guns.
- Full Tune Up Kits come with everything you need to completely upgrade your gearbox, no chance of getting the wrong gears for your gearbox.
- Comes with SP120 Spring, Spring Guide, Aluminum Piston, Piston Head, Cylinder, Cylinder Head, Aluminum Nozzle.
- We recommend metal bushings and a steel gear set with this upgrade (sold seperately)
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