A.G.P No9w folding sight!

[Phloating Phlasher]

This thing is just so splendidly "Steampunk" I love it!
On a more practical note you can strip the bolt for cleaning without removing it too.

AGP9W sight adjust.jpg

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[JohnMOhio]

How did you ever find this? I have not seen anything like this.

[Phloating Phlasher]

I found it on e-Pay.
try a search for any one of these 3:

"SMLE target sight"
"A.G. Parker target sight"
"BSA No9W sight".

They are all basically the same.
They pop up occasionally.
There are several version of the No9, you ideally want the No9W specifically because it has a longer windage arm, which works better with the (comparatively) fatter action of the SMLE over the Martini long lees.
Make sure you get the S.M.L.E. mount bracket. the older ones for the various Martini actions or Long Lees won't fit.