Rusty
Nice looking carbine.
You hit the low number…………. These are pictures of one from the end of that block. The highest number the Carbine Club records show according to newsletter # 357 is 1,874,960. This one is 1,875,011. Last number assigned to that block was 1,875,039.
What do you all think on the S on the rear sight? There are no other markings on the right side or leaf.
It has an Inland barrel dated 8-43. The barrel looks to be original to the receiver, the rear sight and some other parts are probably not.
John