Sorry you are wrong. The screw does not go into the barrel. I will take a picture of this and post it. There is no hole in the barrel. No threads. No way to do what you say. Perhaps after you see the picture you will understand that Marlin was improving by trial and error.

Last edited by Bugger; 08/25/16.
I prefer classic.
Semper Fi
I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally