I'm about to start on my ARctic 15 (yes snow camo in GA) build and want some opinions on the gas system. I will ne running a A2 front sight with either a 14.5 pinned and welded or a 16" barrel. I know the mid length will offer a longer sight radius and more real estate on the rails/further more stable hand placement. Are there any benefits to the carbine length? If I go with the mid length it will be the first one I've ever dealt with.