Quote Originally Posted by Peter Laidlericon View Post
I notice that the backsight ears are missing too. There's a problem because the axis pin holes were used as the datum and jig fixture for many machining operations on the partially finished body, including positioning it to index the breeching up thread

Did we ever get to the bottom of the rifle photographed here with the backsight axis pins apparently (but impossibly....) bored out too low down from new. It was on the forum some months ago now
Hi Peter,
I have a 1930 no1mk6, it came with no rear sight so I've been trying to fit one for some time.
The rear sight ears holes are too low for a conventional rear sight and plunger to work, the sight will mount in a vertical position but will not fold down as there's not enough room on top of the plunger for the sight to rotate past.

The spring hole is also half the depth of a no4mk1 and the diameter for the plunger is smaller than on a no4mk1, so I cut a spring and narrowed a plunger to get it in.

I made it work somewhat after I took a full 1/4 inch corner off the sight and rounded it in order for it to work, however when vertical its now about 10 degrees off vertical, and folds down extremely easily, not good when firing.

My theory is that the sight was on a spring and ball, ala no1mkV, not a spring and plunger, however I haven't seen a picture of the original mk6 set up to know how to modify a later sight to work with this set up.

If anyone can solve this it would be much appreciated as the missing rear sight is the remaining faeux pas on the rifle.