This is a special piston designed by the airsoft geniuses at G&P for the Classic Army and A&K CA25 and SR25. The SR25 is a long range sniper rifle with a 7.62mm magazine well. To give the gun more power it has an elongated gearbox with a larger compression unit. This piston is made to be used with upgrades so the user can achieve a higher velocity for more accuracy and more range. This piston is made to be used with helical gears and will not work in regular length gearboxes.
The use of aftermarket airsoft parts is not an exact science. Some parts may require fitting even thought they were designed to fit without modification. Professional installation of upgrade parts is highly recommended.
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