There has a slight debate going on over on the M4 Carbine forums in response to the pie chart below that helps one understand what their shell ejection on their AR/M4 is telling them.
One of the questions that came up was does this relate to a piston based AR platform. While believe it does, I will wait for someone to chime in either on the M4 Forums or in our comments section to gain a little more insight on this chart.
Any AR fanatics/experts want to weigh in on the issue/chart?