Doco6, the plate measures .485 x .362 x .062 thick. the threads are 4-40. This is for a FW. I also ordered one from Numrich and it was very tight to open the gun. You might have to file it so that it recocks the hammers and also makes the gun easy to open all the way. Take your time doing it and make sure you put the bevel side the right way, I believe up. It's been a whie since I did it and I will look and make sure.