1) It may or may not be DMA,
2) Saying it's seven lines down doesnt make sense, all games are different, it could be anywhere.
3) "Special address" will leave some people clueless, try to specify.
4) This definitely wont work in all games, but it's always great to try.
5) Will more than often be gun specific, depending on the game.
^ Work those into your guide if you can, it will save a lot of time answering questions.
Other than that nice guide.
I'd also suggest not centering it, but that's up to you.