Hello everyone, I have searched online and have come up empty handed so I have come to the forums to seek assistance. I recently purchased a King Arms GP-30 grenade launcher, but the firing mechanism has been damaged by the previous owner and I have no idea how to disassemble it. The problem is the firing pin only fully engages when the trigger is jerked back with some force. When the trigger is pulled normally the firing pin barely moves forward. So what I looking for is an exploded parts diagram, or advice from anyone that has dissembled or modified a GP-30 before.