Sighting discs

[CINDERS]

Cannot find the thread but in the use of sighting discs +'s & -'s on the value of them, it was mentioned about the other sighting aids to use so I took a pic of the types I have.

These allow the instructor to be at 90 degrees to the student to see exactly the sight picture the student has without having to be in front of the rifle.
From L - Rt No 1 Mk III with extended post to raise and lower viewer this sat on the rear top wood behind sights next one same as previous though no post and bigger vision pane lastly the one for the No.4 which clamped onto the rear sight and allowed viewing through the rear peep hole.

Information

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[henry r]