Spare parts for GHK M4 GBBR
－Rubber made, nozzle sealing o-ring (grey color)
－O-ring size (I.D.x W)：14.8x2.4 mm
－M4 V2 spec is the same as the part #G5-15-4
- M4 V2 & V3 have different specifications, please place an order according to the required specifications.