PSS Re: Zero Trigger is a set made by LayLax, intended for Tokyo Marui's VSR-10 replica and its clones. The set sold under the PSS (Perfect Sniping System) brand is a development of earlier designs. One of the innovations is the built-in safety (trigger lock), which previous versions did not have.

In addition to the trigger mechanism, the set includes a dedicated super-light piston with a silencing element. The manufacturer recommends using this option with springs no stronger than an SP120. When using SP130 and harder springs, the brake has to be replace with a provided screw.

The new trigger mechanism is to provide an even gentler and more precise trigger pull, which will translate into increased accuracy of shots. The differences in the "hardness" of the factory installed mechanism and the one made by PSS can be seen at the 0:05 time of the video below.

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Source: LayLax