If you have a No.4 Enfield and you were thinking about trying to find the Parker Hale PH 8/53 ....

PH 8/53 for Enfield No.4 Rifles with Mk1 Micrometer Sights
 (A.J. Parker Model 8/53)

Here's an alternative to check out ...

WT02701 ENFIELD DIOPTER (Click Here) - insert for ENFIELD spindle diopter - precisely adjustable (horizontal and vertical)

Regards,
Badger
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