I am not sure what scope was in the video, but any scope with a 5" or > eye relief can be mounted ahead of the hammer.
The bottom rifle (Handi 357 Max) has a scope with 5" eye relief and is mounted ahead of the hammer.
The "light" is a high density LED for night critters. With 38 Special wad cutters, it makes effective night time medicine for marauding vermin.
Good Luck and Good Shooting