Considering a piston AR, possible to get subs and supers functioning ?

[THE DOCTOR]

I tried using an ares piston conversion on subs with the 300 whisper and a lot of different powders and bullet weights and couldn't get it to run subsonic supersonic was no problem but that defeats the purpose of this round. My gas port is in the carbine position so I have another couple barrels ordered to try it with the port in another position.

Two things that made my gun run more reliably was a heavy buffer and welding one port closed on the carrier.