Familiar with this sight/scope mount?

[browningautorifle]

There are lots of threads here about those two also...lots of guys here have them.

Information

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[Tom in N.J.]

The M1C mount requires five (5) holes in the receiver, three for screws and two for pins.

[DustyRusty]

As soon as I posted that, I remembered the pin holes. haha.

[Bob Seijas]

I wrote an article for the Spring 2013 GCA Journal titled "M1C vs M1D - Was The Fix In?" It seems pretty clear that it was.