It comes with a cover plate and you will also receive a coupon to purchase the AOS plate of your liking for a nominal $49.
Mounting plates available here >>> https://store.springfield-armory.com/agency-optic-system-aos-mounting-plate-1911-ds-1911/#:~:text=A12B%20Plate-,OPTIC,-IRONS%20VISIBLE

Hi Travis and welcome to the community. There is a coupon in the box to purchase an AOS Plate of your Optics Footprint choice. The purchase price is currently $49 from the normal retail price of $129 at: -- https://store.springfield-armory.com/agency-optic-system-aos-mounting-plate-1911-ds-1911/#:~:text=A12B%20Plate-,OPTIC,-IRONS%20VISIBLE --------------- Cheers, stay safe and enjoy!