What serial range and what caliber?
1899 is when it was made.
Here are pictures of the magazine plug and screw. its the same one that is used on the 44 and 38 caliber rifles and carbines with full length tubes. They were probably used on other models as well if they used the same size tube. Winchester didn’t like to make unique parts for each model.
They had a plug that the hole went all the way through and the barrel was drill for the end of the screw on later guns