I just purchased a Remington 1903a3 in very nice condition. but it does have some quirks. The Muzzle is threaded with 1/2-28 threads to the front of the frontsight . The front sight blade is taller than any I have ever seen and is made from shiny metal either nickel or stainless. I had an old Herter's muzzle break so I put that on to keep the threads. Does anybody know if this rifle was ever issued with a threaded muzzle? Could the high front sight blade been necessary to sight over whatever device was intended to be used? Or did I just by a mongrol that just happens to dead on accurate at close range. btw it,s got the most amazingly smooth trigger,