Browning BSS 20 ga: I'm having a tough time translating the choke symbols on the gun. Right barrel shows "**", which I believe means "modified". Left barrel appears to have been mis-stamped. There is this "**" , however only the top half of each asterisk; the righthand asterisk is more fully stamped, but the lefthand of the two is clearly just the top half; as if the dye was not perpindicular to the barrel when struck. Is it possible the this gun could be modified/modified?