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Features
- Full Tune Up Kit with an SP120 spring for M4 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 with bearings, gears, bushings, cylinder, cylinder head, piston, piston head, tappet plate and shims.
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