I think the reason you see more carbine is thats whats at the stores and on average will be less money . Rifle length ARs tend to have better heavy/bull barrels , free floated hand gaurds and that will push up the price .
I do not have a rifle length AR all mine are carbine or mid lenght 16" barrels . I can tell you this my carbine flings my brass farther away then my mid lengths do .I belive all the carbine length gas system was made for is to get a higher rate of fire . The carbine will cycle the BCG much faster then the rifle length. There is how ever some math involved when it come to where the gas port is in relation to the length of the barrel and how efficient the gun opperates .
Last edited by Metal god; November 10, 2012 at 12:27 AM.