I've been told that this is a Browning B-2000 barrel but now I'm not too sure. It has a PB (beretta logo) and AL on it. I think a B-2000 is a Beretta AL391.. So.. what is it.

Looks like a browning b-80 barrel. I have a b-80 barrel on a beretta 303, they are basically the same as the beretta 301,302,303 barrels except for the rib.

Thanks.. It is a B-80. I finally got a hold of a diagram.

Rich