I don't want to steal the OP's thread but since it is a year o.d, thought I'd chime in. I am running a FF III on my 52-1 using an EGW mount. The mount replaces the rear sight with no slide modification at all. The cost was around $50 straight from EGW.
To answer a previous question, I can see no difference in operation since I installed the red dot sight.
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