BB:

'Smelly' is the common nickname for SMLE, more properly Short Magazine Lee Enfield. A bit parochial, perhaps. Apologies.

I'll measure the aperture and back-bored dimensions on the 'smelly' sight when I photograph it, sometime on the weekend, and post the details here. It's not exactly as drawn, since it had to fit onto the clip-loading bridge, but same tube principle. A fixed sight with no adjustment is always stronger, and never on the wrong setting! All you ever need for the first hundred yards. (...or perhaps 75 yds in the case of a 12-bore slug!

)

elvas: Thanks for the details of that sight set-up, I'll have a look at it to get the ideas going. I certainly intend making the sight myself, though. If you want something done right....