Welcome. There are folks here who know way more of the technicals than I do... And I don't know your level of knowledge either, so apologies if what I am about to say is basic knowledge to you. Test your barrel/gas assemblies with all of the ammo you intend to use and stock. Shoot them at various gas settings. I'd say starting from the middle gas setting and work your way down until you observe a failure to feed or eject. It'd be a waste of ammo to start with the gas system way up since (unless incorrectly manufactured, which is always a possibility) the rifle is most likely to cycle with that much gas.