forgive me about ignorance. but how this help to the rifle? it's like a hop-up?

thanks . i searched this subject before i ask ,but now i understand better thanks to you!

hello :wink: , i don't understand the all subject of ratio :? . and now i want to build a Marble size combustion, so i want to ask you what is the best ratio for this cannon (for the best performances ), and how i calculate him . and i saw that there are loud cannons and quiet cannons , what the dif...