I have a Remington M1917, it has been voted “the ugliest”. I bid on and won the rifle for $120.00, when it comes to ugly nothing comes close to the five holes drilled in the top of the front receiver ring. The Remington M1917 was the first choice for a build because it did not have the cut out on top of the rear sight bridge. The Eddystone and Winchester had the cut, filling the hole was/is not absolutely necessary.
One of the two rear holes could double as a ‘Hatcher’ hole. The Remington M1917 is a strong receiver, I do not know if the receiver ring has been compromised because of the holes drilled in a line. The receiver/barrel square threads could offer an advantage, not my job to sell anyone on the advantage of square threads.