I was hoping someone can help me with picking the right gas port size for a 16" mid gas system. I'm running a carbine buffer and tube. I have an H and H2 buffer. I was told that a .750 might be to big. I know there are a few sizes out there for 16" middies . I keep finding the .750. I'm going to agin show Saturday and want to figure this out. I don't want to over or under gas the operation. Thanks guys.