I feel that there should be a thread for each internal part of an airsoft gas gun. I know a few of the major parts such as the gearbox and hop up and what not. But i have no extremely detailed knowledge and would like to be educated on this matter expertly. So i ask that a 101 guide be created in the format of naming each piece, adding a picture, explaining what its function is, and the best brands. This is not a thread for arguments or conversation. Please be detailed and speak as if i know absolutely nothing about the gun. I have made another request for this in Electric and spring guns.