This Maple Leaf M120 spring is a non-linear spring suitable for AEG airsoft replicas. The non-linear structure of the spring means that this spring consists of several coil windings. The coil windings that are closer together ensure that a lower resistance is created than with the windings that are further apart. The advantage of this is that the teeth of the piston, which is located inside the gearbox, are significantly less stressed.

The Maple Leaf M120 spring is made of steel, has a length of 17.5 cm and a diameter of 14.4 mm.