King Arms GP-30 Grenade Launcher For AK Series AEG GBB Rifle (For Under Barrel or Standalone Use)King Arms GP 30 Grenade Launcher For AK Series AEG GBB Rifle (For Under Barrel or Standalone Use) Made out of metal and nylon fiber. Military Type Airsoft Grenade Launcher for under barrel or standalone use. The mounting system helps the launcher to be installed and detached easily. It can be used to store battery as user's preference. Suitable for King Arms M381 HE VN and M433 HEDP cartridge. Compatible with all standard 40mm airsoft grenade shells.