I have two of them, they are great and both Chrony at 10.5/11.5 ft/lbs - they have open sights and no means of fitting a 'scope.

TBH using open sights was how I learned to shoot. You either aimed and hit or missed. You learned that you REALLY had to decide that the foresight was EXACTLY on a level with the top of the "U" of the rearsight. Then you had to centre the foresight EXACTLY in the middle of said "U" at the same time. I still do the same juggling act today - don't breathe when shooting.

So - in answer to the original post - yes, Mk3 with open sights is just as good as a modern gun with a tele at the same (close) range.

But are you?