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 M1icon 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 Denmarkicon said the following:
Quote Originally Posted by lgo View Post
I know this is an old thread but I just want to clear a misunderstanding.
The M1917 rifles or M/53 (17) as they are officialy named by the Danish military that are being used by the Sirius Patrol in Greenland does still have their original rear sights. The Sirius Patrol is a Danish military unit and uses the rifles in original condition as issued and they are as far as I know not modified in any way.

The M1917 rifles wtih cut-off rear sights are surplus rifles that were modified and sold to the local civilian hunters in Greenland via the Kgl. Grønlandske Handel which roughly translates into the Royal Greenland Trading company. The reason for the modification, as Promo correctly says, was because the hunters didn't want the peep sight as it was easily blocked by snow and ice. The modification was performed by Kgl. Grønlandske Handel who used a subcontractor to do the actual work. The Danish militay has not used rifles where the rear sight has been cut off.
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.