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Gas ports lands or grooves?

Wheres-Waldo

Gunny Sergeant
Full Member
Minuteman
Nov 2, 2008
1,661
540
Unknown
Is there any difference in whether a port should be located in the land or groove of a barrels rifling?

Furthermore, I've been advised that a port that has been located in a portion of rifling that bisects a land AND a groove has no effect on accuracy... True/False?

I Google'd it up and there are a few threads here and there discussing lands vs. grooves, and even fewer discussing the effects on accuracy of a bisecting port.

Anyone have any ideas?