Hey guys, I am building an AR 15 carbine or mid. My question is choosing a mid length or carbine gas length barrel. I will be using a Spike T2 buffer, carbine receiver extension mil spec. I am most likely going 1:7 or 1:8 rifling with a DPMS muzzle Brake ( Miculek) I will be going with a 16" barrel 556 cal With a brake and heavy buffer , should I just stay carbine to ensure reliable function? Will the mid length be reliable with a comp and heavy buffer as far as cycling goes. Thank you for any advice.