Fitting a SA oprod to a M305

[Riflechair]

Hi guys
I'm not too sure about doing this myself.
The tab appears too large for the groove and needs filing
Looking for a practiced hand to give guidance (or maybe I just mail it to someone you recommend?).

Any recommendations?

Cheers
RC

 

[45ACPKING]

seeing as I have made myself unavailable to the masses casey at tac ord