UPGRADE AIR GROUP KIT FOR VSR MB02 / MB03 / MB07 WELL (MB03JOULE 3)

Spring kit
complete with spring guide rod and metal piston
for mb02 / mb03 / mb07 / mb11 / mb12 rifle

Composed by:
Anti-yielding steel spring.
Metal piston with oversized O-RING.
Spring guide in cushioned metal.
(a power of about 3 JOULE can be reached).