Includes:

• Systema m120S Spring
• Systema Metal Bushings
• Systema Torque Up Flat Gears
• Guarder Polycarb Piston
• Polycarb Piston Head with Bearing
• Spring Guide Rod with Bearing 
• Professional Installation

*fps is based on an average, firing .20 bb's.  Your actual performance will vary depending factors like inner barrel quality, length, bb weight and other factors. Parts maybe substituted for equivalent parts from Guarder, CA or Systema.