All standard out-of-the-box VFC GBB come with a non-adjustable floating valve, but maybe some game sites are only allowed with certain FPS. Now one gun can be used anywhere, with no need to change guns all the time.
Suitable for :
BCM,VFC Umarex G3, FN FAL, Umarex HK416, HK417, SR16, M4, MK17, MK18, M110, SR25 ECC, MP7.
Suitable for :
BCM,VFC Umarex G3, FN FAL, Umarex HK416, HK417, SR16, M4, MK17, MK18, M110, SR25 ECC, MP7.