Way cool!! Thanks Tom and Harry! The actuator pin thru the barrel lug on that Hollenbeck Gun Co. B-Grade double serial number 215 is slightly differnt than I've seen on other Hollenbeck/Three-Barrel/Royal Gun Co. doubles. Most I've examined don't have that little sliding rectangular bit at the front of the lug. That certainly made for an extra bit of fitting work to the notch in the lug and the receiver.