Hi,

I've just picked up a PH25 Rear sight, which I understand was fitted to BSA Martini's from the 1940's. As far as I know it isn't the improved model 25a/b/c etc.

My question is, what size is the thread for the apertures/eyepieces to fit this and will other Parker hale or BSA or Anschutz apertures or irises be able to work without an adapter?

Cheers
wags
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