Should the gas port be visible?

[An Undocumented Worker]

From speaking with DD in the past, they try to get the gas port drilled into a groove of the rifling, aka between the lands. On a 1/7 twist barrel a gas port drilled into a groove of the rifling will be difficult if not next to impossible to see by the unaided eye. Due to the lands obscuring your veiw of the gas port drilled into a groove that far down the bore.

So stop worrying about it.