Something that seemed to come with the pump/auto guns is the milled rib. My Remington 10-D has one and it looks pretty good. The tooling must have been around a long time as I bought an 870 barrel with the same milled pattern. It is 28" full choked and is the start of my grandsons straight stocked 16 yard trap gun.
I am not too sure of other gun makers that used the same milled ribs.

Last edited by AZMike; 08/23/20 08:02 AM.