You do not show front sight nor rear sight with your rifle that you have posted in here, nor how it was installed or machined. Please share pictures of this.
Within how were the RGTC rifles prepared for scopes?
The rifles that Bisgaard & Nielsen were selling all had the rear sight bases milled off, no provision for a M1 sight such as in your link, and all had an emergency rear sight fitted to the barrel shank. B&N claimed they come from the RGTC.
Another member in here who is also from Denmark said the following:
Link to this post here:
https://www.milsurps.com/showthread....l=1#post339206
So basically he is saying the opposite of you. According to him the rifles from the Sirius Patrol still had the original sights, whereas those which had the cut off rear sights (not even speaking of the replacment of it with a M1 Carbine rear sight) were modified by the RGTC for hunters in Greenland and therefore non official modifications.