Rexrider
Member
What does that mean? WHat's the difference for a flat top rifle in the front sight?
The front sight post is a different height for flattops and an A2 upper (carry handle is not removable). The F marking designates the the front sight post is for flattop receivers.
You want the F marked upper with a flattop.
Concerning the carry handle option. I ordered my CMMG upper with a LMT BUIS (Back Up Iron Sights). I chose that option so I would have the same rugged sights as a carry handle but can still mount and co-wittnes optics. Just something to think about (see attached picture).
Also, CMMG prices are in line with most other online retailers. You may as well order everything at once and save on shipping costs.