The PH5E was a generic sight that had two mounting options with different brackets - both of which fitted into the recess at the back of the sight 'body'.
1) PH5E was for the Mauser action
2) PH5E4 was for the No4 action
I have taken PH5E's and removed the Mauser 'bracket' and added the No4 bracket. Quite simple if you can get the correct No4 bracket.
I had dimensioned 'engineering drawings' if you need to get a No4 bracket made up - let me know and I'll try and find them.
One thing to remember is that with the PH5E4 you CANNOT use the safety. A special safety was made solely for the Enforcer (the only No4 to use the PH5E sight)
You will either accept 'no safety' or can machine down an existing one to fit.Information
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