VSR-10 Upgrade Spring 520fps PDI

Upgrade spring for Tokyo Marui VSR and copies. With this spring you can reach a muzzle velocity of 520 FPS. However, if the weapon is properly sealed and mounted, the muzzle velocity can be higher.

• Springs are all “perfect” variable pitch, giving light compression and quick return. Some springs use a different “variable pitch”, but these are hard to compress and do not give the desired force.
• PDI uses silicon chrome steel to make the springs. PDI can also fine tune the pitch with this steel, so we can offer different powers.
• Each spring can look different because our springs are individually made by skilled craftsmen. Springs that provide the same force can be slightly longer or shorter.
• PDI’s springs do not shrink! Generally, the spring will shrink from 15mm to 20mm. We can control under 13mm-5mm.

Notice: Outside diameter of this spring is 13mm and can not be used for the original plastic pistons. Use the 9mm spring guide and the piston with the 13mm hole.