Parker Hale PH25 Rear sight and Aperture compatibility

[wags2477]

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

Information

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[Peter Laidler]

To be honest, you just can NEVER tell what you're getting with any of the PH sights. The threads vary from BA to anything similar and..... and......

There was a good thread o this forum somewhere. I think that P-H changed things weekly just so that the average graduate engineer couldn't ever quite fix one with the bits he had handy so you had to send it to them - together with an open, signed cheque!