[QUOTE=Steve Cambria;160807] It's a false rib, emitting a similar sight picture as a full vent version.
Right Steve - that's what I suggested in my initial post and that it would raise the POI of the shot charge.
I don't however, agree that it was done by a tinkerer. Until it is proved otherwise I'm sticking with the 'factory installation' for the simple reason that is is matted exactly like the barrel rib.
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