I recently acquired A NPM carbine and I need some advice from those with more knowledge of this model. My carbine has a serial number range of 4363xxx. It is a contract gun as it has the "U" stamped behind the number. Would this serial number range be appropriate to have a type 1 flip sight ? It has an S on the left side and RN on the right side. Also, is a hi-wood stock correct or should it be a low wood ?
No NPM's were produced with adjustable sights, all came from the factory with flip sights. So if your weapon did not go trough a rebuild (no bayo lug, no flip safety, etc) then it could be original. By your serial type 3, low wood stocks would have been used but you never now what was laying around in the bins. Show us pictures.
Receiver was made by Union Switch and Signal for NPM late in 1943 time frame. High wood stock with oval cut oiler slot would be right at the break point area for your serial number so it would be correct. Markings on the rear sight also fit in the time frame of your serial number. Pictures would be great if you can post some.