M91/30 PU scope mount pins

The dowels serve as locating pins for the base and a reference for zero. If the base shifts with just the two machine screws, or if they back off, your scope is off and then wanders. More work drilling 4 holes than 2, but might be worth it. Measure twice, cut once!
 
You probably won't see much difference in the mounting with or without the pins but IMHO it's more historically accurate with them.
 
I use the pins as well. My logic is it's there for a reason, use them it's not really that much more work to set up.
 
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