SPRING 105 m / s FPS (FPS105Più) VARIABLE PITCH COILS

105 m / s FPS spring has been calibrated on 363 mm barrels and gearbox with type D cylinder (for barrels from 301 to 400 mm).
Of course, with shorter or longer rods the performance will decrease or increase, so you will switch to the harder or softer calibration.
The thickness due to the spring guide and piston head bearings was not taken into consideration in the calibration process.
For this reason, with the same initial conditions, an increase in performance of about 2.5 m / s for each bearing must be taken into account.
The FPS spring is 100% Made in Italy.
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 forming, the spring is stabilized in the oven at a temperature of 400 degrees centigrade for thirty minutes in order to optimize its duration over time.
The spring has coils with variable pitch in the central area and in the one in contact with the spring guide and undergoes a grinding process at both ends which guarantees optimal performance in the compression phase.
The dimensions of the product are:
length: 170 mm
external diameter: 14.30 mm
It is recommended to use the spring in association with spring guides and bearing piston heads to ensure maximum performance and durability.