Valken Thunder V2 CO2 Sound Simulation Grenade Core SetThe Valken Thunder V2 Co2 Sound Simulation Grenade Core is the next generation of Valken Thunder V sound grenades. This airsoft simulation grenade core is powered by a single 12g Co2 cartridge, and emits noise only when used in conjunction with a single use shell (sold separately). We recommend that the fire lever and pull pin are reset fully before inserting a Co2 cartridge to prevent pre mature detonation during assembly. The core holds a standard