The Peacebreaker

[micheus]

Nice gun.

In the 3rd image we can see a clear artefact created by the use of a n-gon in a situation which the faces are not coplanar. The region where you create the hole created that.

If that hole was not moved out from the original face you can fix that by just adding the original edges back:


Since you are already not using only quad-faces that cannot be a problem. But, if the hole must be not coplanar to the original face then you must to evaluate other options to avoid that artefact.