07-08-2020, 04:33 PM
As long as the barrel maker sizes the gas port properly, you'll be fine either way. While a Rifle length gas system will probably be more tame, I have an Alexander Arms 18" Midlength system and I have no issues with it. I would pick the barrel that you feel has the best combination of price, features, and availability and not overthink the gas port location. Besides, with adjustable gas blocks now being as affordable as ever (see Wojtek Weaponry), you might as well get one regardless of your gas system.