Dobry Den,
Looks like a very nice scope ...
It is a personal opinion and you are free to do as you please but if I wanted to scope a DSM I'd go down the road of finding a scope with a 11 mm rail detachable montage in order not to modify the rifle.
Should you decide to go ahead, as Mauser 99 pointed, make sure first that you have room to cycle the bolt. Maybe, unless you have done it before, as it would be such a shame to damage a DSM, it is perhaps a job for a qualified gun-smith ?