Unusual Bore inspection tool.

[GDU]

Hi,

Any Idea what this thing is for?
Cannot be used in a rifle so I'm picking spare barrels or another 303 type gun.

Information

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[paulseamus]

Found this

http://www.themilitariadealers.com/viewitem.php?id=916

And this

WW2 RAF BATTLE OF BRITAIN .303 inspection Bore for Fighter plane guns. (10/23/2012)

Appears it is for inspecting bores on 303 Vickers Machine guns, as fitted to RAF aeroplanes.

[mike1967]

The AM crown is the old Air Ministry marking.

[GDU]

That's pretty cool.
Any idea on scarcity and value?

[Surpmil]

What is the view like up a barrel with this device? Any magnification? Focus adjustment? Odd that it is described as a "mirror" when it is plainly a periscope.

Wray Optical Works Ltd., est. 1850, Ashgrove Road, Bromley Hill, Kent. (SIMA Handbook, 1952.)

Better info here: Wray (Optical Works) :: Rochester Avionic Archives

Despite Wray holding contracts for Head Up Display optics, Kershaws never made any and ultimately lost the business which was quite short-sighted of the Rank Organisation.

Wonder who got that job then, and how!?

Wray (lenses) - Wikipedia

Learned something else tonight: the British single lens reflex: Wrayflex