I'm debating a new side gig. I am thinking about getting certified as a gun smith or at least getting certifications as an armorer for all the major brands. For what most gunsmiths/shops charge for installing sights and RMR's I could charge half and still make a decent profit. I have no interest in alot of the stuff Gunsmiths do though so Armorers certs may be the thing.
In 4 days I have installed more than 100 RMR's and night sights. As long as you have a decent sight pusher it's easy as can be. And it doesn't take long.