120 SRC SPRING (UP-01)

Attention: This Accessory Increases The Compression Of The Spring With A Possible Result Of 0.30 M/Sec. More'.
(Ex. On Low Cost G36 It makes 122 M/Sec = 1.50j).
For Marui Compatibles.
In oil pre-hardened harmonic steel and chromed.
In Irregular Spira.