Hi Michael, This has slots for adding a red dot sight or scope rings machined into the receiver. You can see in the 3rd & 4th picture here >>> thefirearmblog.com/blog/2020/05/12/escort-introduce-the-slugger-series-of-pump-action-shotguns/
Here is a rail that would fit, this has two mounting points on each side to fit over the gap budsgunshop.com/product_info.php/products_id/132553/ncstar+adapter+3+8+dovetail+to+picatinny+rail+black ,
Stay safe & have a great day!

Good evening to you!! Sorry but no. The Escort Slugger is not drilled and tapped to accept sights. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸

Hi Michael and welcome. No sir, the Slugger is more of a basic home defense gun and designed for close range shooting, so it is not drilled & tapped for a scope or optics mounting. Cheers and stay safe!

Picatinny rail allows for the mounting of Picatinny or Weaver standard scopes, red dots. Fits Escort slugger shotgun and allows for use of a standard rifle scope, reflex sights or other optics. Rail adaptor installs easily via dovetail mount and one vertical stop pin.

Not drilled and tapped.