I dunno'. I was thinking maybe some sort of identification coding that means something at the factory (?)Looks like holes drilled to lighten the weight of the slide. Otherwise I haven’t a clue.
Yep, It is odd. I think I'll email Ruger for an answer, just for the heck-of-it.. Before seeing these "dimples" I would have assumed they keep track of production batches by the serial numbers.Sometimes companies make marks like that for factory records of production batches made on specific machines but they usually make 2-3 marks not a whole row of them.