POM plunger piston head with double o-ring and piston engagement angle adjustment (XPPA).
The new generation of FPS piston heads has been equipped with X-RING technology
One of the lightest of those produced by FPS for rifles with gusts up to 25/30 dots per second.
Its adoption lightens the weight of the striking mass consisting of piston and piston head with a noticeable decrease in mechanical stress and noise.
Using the supplied shims it is possible to find the right length of the train formed by piston and piston head, to obtain the best possible angle of engagement with the teeth of the sector.
The adjustment levels are 1-2-3- or 4 mm if all thicknesses are used.
The XPPA head can also be used without shims, like a normal piston head.

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100% MADE IN ITALY