If you have no intention to use an optic, then why not. You can always take the carry handle off later if you change your mind.
I put some cheap red dot on one of mine like that several years ago.I was taught to shoot, with my head upright .....
I like my carry handle, with my scope mounted on it .....
JMHO ..... YMMV .....
I now have 2, used to have 3. I have an M16A1 and M16A2 type.
The A2 is nice if you do a lot of target shooting. The A1 is better for combat type shooting.
While the A1 has seen a retro Renaissance, it has yet to extend to the A2 yet and sources are dwindling pretty quick for carry handle A2s.
There is also the C7 type. This is A2 upper with the A1 sights. You can find those fairly cheap if you look.
If you want the 20 inch A2 upper. Best price I have seen for the complete government upper is AR15 sport. It is decently priced.
AR15 complete uppers and build kits.