I will add that the 1 1/8" pin separation on Patrick's little frame is the same as the separation on my ten gauge sidecocker. This is not hard to believe since hundreds if not thousands of ten gauge Parkers were made on the #2 frame which has the identical pin separation, and at least one ten gauge Parker has been studied which was made on the #1 frame which has a pin separation of 1 1/16". I wouldn't shoot that gun, but someone has and it is still intact.