I'm considering getting my SP01 milled to be set up for carry optics, but am having trouble deciding on a dot. Ideally, id like it to be reasonably inexpensive (sub $400), and not require an adaptor plate (yet again due to miniscule college student budget). So far, this seems to leave the deltapoint pro (heard issues with these breaking on steel frame guns), vortex options (heard mixed quality, but great warranty), and sig (heard little to nothing about putting these on metal guns, but the window size looks good). I love my holosun on my p10, but the RMR mount pattern is too wide for the SP01 without an adaptor, and the window size isn't great.
I'm planning on going with primary machine for milling/cerakote, since they did great work on my p10c, but am open to other options if other places have significant advantages.