Anyone know why this rifle has a notch cut into the rear stock?

[scoombes]

I don't have all of the information with me but this rifle belongs to a friend. It is a Long Branch No 4, all of the rear sight mounting hardware has been removed/ground off. A ramp style sight was put on the front of the barrel and a rear sight was placed in about the location of a No 1. What intrigues me most is the flat notch that has been cut from the top of the rear stock. The notch is rectangular and neatly cut with a screw hole at the centre odf each end of the rectangle. This is the only photo I have right now.


Any Idea what this means?

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