Upper tang plug screw Winchester 1890/1906, 1903, 62 and 62A, 63 1866, 1876, 1873, 1892, 1894 model 53, 65

Plug screw that fits into the upper tang on the 1890 or 1906, 1903, 62, 62A, 63 1866 1873 1876 1892 1894 1886  model 53 and 65 Winchester rifles. This screw plugs the hole right behind the hammer where, if you had a tang mounted sight, the screw would go to hold the sight on.