One after market sight manufacturer alluded to the dove tail on the MP series pistols as having exhibited variances. As for sight pushers a local fellow whom reports to be a gunsmith has the top of the line sight pusher ($500-$600??Cost). He managed to mess up the instillation of a Novak front sight and a 10-8 rear sight. What can you say other than he did his best which wasn’t good enough. That’s been my experience with the MP to date.