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WELL MB01/04/05/08 120 m/s FPS spring has been calibrated on original sniper rifle.
Of course with shorter or longer barrel the performance will decrease or increase,
therefore the calibration will be harder or softer.
In the calibration process has not been taken in consideration the thickness
due to the bearings of the spring guide.
So, starting by equal initial conditions, you have to take into account of a
performance increase of about 2.5 m/s for each bearing.
The FPS spring is 100% Made in Italy and it is produced in collaboration with
leading companies in the sector.
The material used is steel wire burnished and pre-hardened carbon steel with
addition of silicon and chromium EN10270 / 2.
In the phase immediately subsequent to forming the spring is stabilized
in the oven at a temperature of 400 degrees celsius for thirty minutes
in order to improve its durability.
The spring has coils with variable pitch in the central area and in that in contact
with the spring guide and undergoes a process of grinding the two ends which
guarantees optimal performance in the compression phase.
The dimensions of the product are:
- length: 235 mm
- outside diameter: 10,25 mm
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