That may well be just short of impossible. I know there are differences between the trigger plates of the 1902 Model and 1904 Model in 12-gauge Baltimore Arms Co. guns. Don't know about the 1900 Models as I've never owned one. All the 16-gauge Baltimore Arms Co. guns I've recorded are 1902 Models. With only about 6000 Baltimore Arms Co. guns made, and a small percentage in 16-gauge, you will need a lot of luck.