Steel outer barrel for GHK GKM
• To increase the quality of replica.
• Material: steel
• Length: 40cm
• Compatible with: GKM, GKMN, GIMS, GKMS
• Compatible but needs modification: GK74MN, GKS74M, GK74
X NOT FIT: GKS74U, GK105, RPK
**Please refer to the following instruction of how to put barrel o-ring on it: