Dan, I have to apologize for not doing more homework before posting, I had to correct some of the above information. An early Model 25 I have is counterbored for the takedown screw and the screw from a late Model 1914 will fit & tighten up, but that screw is threaded farther than some others but I still think is was original to the gun. It does stick out the left side of the receive slightly but measuring the receivers the Model 1914 at different spots is between 0.805' & 0.819" and the Model 25 0.789' to 0.785', so there is not much difference. Jack First Gun Parts lists takedown screws for the Model 1914 that the pictures show to be threaded about half way, if the picture is correct it should work in an early Model 25.