I am getting ready to build my first 300 BO upper that will be run suppressed full time. It will be a HD/range toy/varmit hunting upper. Right now, my plan is to use a 9" BCM 300 BO barrel and BCM gas block and my can is a Silencerco Omega. Has anyone run this upper combination with an A5 buffer system? How does it run with supers and subs? Which buffer are you having success with, A5H2/A5H3/A5H4? Is there anything I should know/change before I put the upper together?