This is a high quality custom set up for likely one the smallest MOS out there in a great pistol. Slide was custom milled by C&H Precision and the Shield Sights RMSc Glass Lens Red Dot Optic direct mounts without a plate needed and has the built in rear sight for co-witness. The RMSc Optic with Glass Lens new was $575 and the slide milling cost $175.