(T) Micrometer Question...

[Bruce_in_Oz]

It is all detailed on pages 81 and 82 of, "An Armourer's Perspective: .303 No.4 (T) Sniper Rifle and the Holland and Holland Connection" By one Peter Laidler avec Ian Skennerton.

The "battle" aperture is filed / ground off the leaf, to allow suitably low mounting of the scope.

With an "unmodified" back-sight leaf, you have to stand it up to remove the bolt. This is a problem with scoped rifles.

The back-sight leaf and the cursor slide are "relieved" so that, during bolt removal, the bolt-head can run freely out of the body with the sight "lowered" and the No. 32 scope still mounted.

On page 81 it is also noted that, to reduce "shine", the leaf could be Parkerized by unit armourers.

Information

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[Lee Enfield]

...snip...

With an "unmodified" back-sight leaf, you have to stand it up to remove the bolt. This is a problem with scoped rifles.

The back-sight leaf and the cursor slide are "relieved" so that, during bolt removal, the bolt-head can run freely out of the body with the sight "lowered" and the No. 32 scope still mounted.
...snip...

ONLY the base block should be relieved, do not touch the cursor slide. I have seen a number of sights which have been destroyed by "well meaning" owners attempting to "improve" their rifles.

In several hundred rifles, I have NEVER (not 1 time yet) seen this modification on an original No4T (except by people who read or heard of the mod. in PL/IS book).