Two thoughts come to mind for me; the first is that it may just be for decoration....if you look at a lot of those North African muzzleloading rifles, they are quite ornate, so maybe it is just 'for show'.
The other thing I was thinking of is that it might be for more consistant ignition? If you stop and think about it, most of thier fighting was done on horseback in windy, dessert conditions....maybe the grooves helped direct sparks more readily/consistantly in the pan with the grooves under those conditions than without them? Just a thought.
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