No it’s not [a flattop]. It’s got the carry handle sights.
It's a flattop upper with removable carry handle; if you look closely, you can see parts of the attachment mechanism (the 'thumb nuts') on the side facing the camera...
111 posted on 06/21/2021 10:16:08 AM PDT by Who is John Galt?
("He therefore who may resist, must be allowed to strike." - John Locke)