That rifle looks a lot different now...ACOG, no bi-pod, no foregrip, etc, but I felt like contributing.
I have never seen a optic like that where did you purchase that?
and a front sight in the way.
What brand is the messed up one?
What brand is the messed up one?
RRA Lower
Spikes Upper
Del Ton barrel
MI Carbine rail FDE
Magpul MOE and MIAD
Troy Flip Ups and Medevil
Eotech
Upper