no.5 micro sight on a no.4?

[Peter Laidler]

I could be wrong Max, but I have seen and fixed about a zillion No4's and 5's - but surely, the actual SCREW, adjustment on the Mk1 No4 sight and the Mk1 No5 sight are the same - as is the round matching cursor slide nut. From memory, I seem to recall that there WERE different types of No5 screws but only in that the thread was only partially rolled down the shaft........

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[Maxwell Smart]

I could be wrong Max, but I have seen and fixed about a zillion No4's and 5's - but surely, the actual SCREW, adjustment on the Mk1 No4 sight and the Mk1 No5 sight are the same - as is the round matching cursor slide nut. From memory, I seem to recall that there WERE different types of No5 screws but only in that the thread was only partially rolled down the shaft........

It's been nearly 30 years since I've owned a genuine No 5 rifle, all I can say is that the measurements which I've quoted are from sights I have on hand now; whether these were ever part of the UK MOD system I do not know...

The 800 yards sight which I measured was one which I got off e-bay from the UK. It is in as-new condition, marked with a "P" and part no CR 318. The adjustment screw on this sight has a diameter of .140", and the thread is not rolled the full length of the screw. The 1300 yard sight has a screw diameter of .110"; it is not easy to measure on the assembled sight, but the 800 yard one is noticeably thicker. The leaf on my 800 yard sight moves half the amount of the 1300 yard leaf for the same number of clicks...

It could well be that this shiny new sight is a modern repro, so I went and dug out an 800 yard sight I bought 25 years ago, fitted on a No 4 Mk1/2. This one is marked with a "B" and broad arrow arrow stamp, with no "CR" number. The older sight has the same adjustments as the new one, so I'm still convinced that the 800 yard sight will give finer adjustments.