I have a K80 32" fixed choke step rib O/U barrel and it has the small hole porting. The original owner said he sent the barrel to Wilkinson years ago put it is not stamped because it was ported when he sent it and Tom usually does not but his name on it if someone else does work on the barrel before he gets it. The bore is 740 and the chokes are bottom 14th and top 27th but there is NO PAPERWORK with it. Not sure what # of the front hanger and the barrel has the new style ejectors. The original owner said he had no idea what he did with it but the barrel work is consistent with Tom's work. Not sur other than his word . The bluing is good and the block ears are good. (( $2100 Delivered to your address in the Lower 48 )) Any questions please send a conv message for info and contact # - Thanks Bob