This instructable follows my first and has the main goal of going past the first week or month of the sport of airsoft. I avoided calling it an intermediate's guide because this area is very vague; I do not consider myself an expert. But airsoft is accessible to anyone who wants to play, past the core rules, I don't believe there are stupid questions from anyone with a gun and a mask on. Should a novice know the inner workings of a gearbox? Should an experienced player know? Mostly the answer is a qualified no - there is no rule requiring knowledge of gearbox maintenance or repair. However this information is useful to many players who are willing to open up their guns and check things out. I'll try to make this almost a "survey" of the different subsets of information about airsoft and gameplay advice in CQB.
Also, I'd like to thank all of those who read and rated my first airsoft instructable. I read every comment and appreciate the feedback. It has been much too long since my first guide; owing partially to the fact that I've been out of the game for a bit and mostly to the fact that I didn't really know where to go from the first instructable. The impetus to this instructable is refreshing my own knowledge, replying to comments asking me questions, and the realization that no other instructable I've seen has approached the topics I want to. There's a niche, and I'm going to give a shot at filling it.
And special thanks to those who noted my efforts at writing a concise and planned guide.