The 140 m / s FPS spring has been calibrated on the original mechanics of the MB03 rifle of the Well brand.

Naturally with shorter or longer barrels the performances will decrease or increase, so we will pass to the harder or softer setting.

In the calibration process, the thickness due to the bearings was not taken into consideration, so with the same initial conditions, a performance increase of about 2.5 m / s must be taken into account for each bearing.

The FPS spring is 100% Made in Italy and was made in collaboration with leading companies in the sector.

The material used is burnished and pre-hardened carbon steel wire with the addition of silicon and chromium EN10270 / 2.

In the phase immediately following the forming, the spring is stabilized in the oven at a temperature of 400 degrees centigrade for thirty minutes in order to optimize its durability.

The spring has turns with variable pitch in the central area and in the one in contact with the spring guide and undergoes a grinding process at the two ends which guarantees optimal performance during the compression phase.

The dimensions of the product are:

- length: 210 mm
- external diameter: 10.25 mm