FPS Arc 85 m/s AEG

The FPS spring has been calibrated on the inner barrel of 363 mm and D-type cylinder gearbox (for internal barrels from 301 to 400 mm). Of course, with a shorter or longer inner barrel, the performance will decrease or increase, so the calibration will be harder or softer.

In the calibration process, the thickness of the spring guide and piston head was not taken into consideration.

So, starting from equal initial conditions, you should take into account an increase in performance of approximately 2.5 m/s for each bearing.

The FPS spring is 100% Made in Italy and is produced in collaboration with top companies in the sector.

The material used is polished steel wire and pre-hardened carbon steel with additions of silicon and chromium EN10270/2. Immediately after forming, the spring is stabilized in an oven at a temperature of 400 degrees Celsius for thirty minutes to improve durability.

The spring has variable pitch coils in the central area and in contact with the spring guide, undergoing a grinding process on the two ends that guarantees optimal performance in the compression phase.

The dimensions of the product are:

- length: 170 mm

- outer diameter: 14.30 mm

It is recommended to use the spring in combination with the ball bearing spring guide and AEG piston heads for ball bearings to ensure maximum performance and durability.