The one I have here was made in 1992 and it definitely does go through and into a hole in the barrel. I checked the two my brother owns the other day and they both go through too. Both of his are also JM guns produced in the 90's. I made a point of checking them just because of this discussion. None of the screws are THREADED into the barrel and I never said they were. They are a two diameter screw that threads into the magazine plug and have an unthreaded section that sticks through into a hole in the underside of the barrel. Just like the Winchester 94's mag plug screws.
