I'm wondering if it's possible to attach it to a pistol without having the slide drilled? I knew that some of them it was possible to remove the rear sight and attach it some way in the notch. But I'm unfamiliar with red dots and sorely in need of knowledgeable advice. If it's not possible would it be possible to drill the slide myself? I've got much experience drilling metal but no gunsmith experience except for changing triggers and springs simple stuff like that. Barring any of that how much do you reckon it would cost me to have a gunsmith drill 2 slides for me.