Ryohin Buhin Mag Main Spring for Tokyo Marui VSR-10 Series, Non-Liner, Variable Pitch, MA110 Spring Rate

Compatible Airsoft Guns: Tokyo Marui VSR Series, Maruzen APS-2. Installation Difficulty: ★★★★☆ | This is an advanced part that requires disassembly of the cylinder area and possible modifications or adjustments. This is a variable pitch spring made by MAG specifically for the VSR series. Variable pitch springs have a narrower pitch (the distance between windings) along the middle, and have the following characteristics: ■ When the bolt is pulled: The "wider pitch" compresses first with less resistance, followed by the narrower pitch, resulting in less resistance. ■ When the trigger is pulled: When the spring is released for firing, the "narrower pitch" expands first, resulting in a stronger initial force.