SRanch111,
My only experience with iron sights on an AR with a rail, thus far, has been with my Stag M4. This rifle came with the Stag rear sight and uses the standard M4/AR-15 "G.I.", fixed front sight.
If for no other reason than the quality of their other products, I would suggest Magpul MBUS front and real sights. I have a DPMS Oracle/LR .308 rifle and have nothing but good things to say about that product. My choice was to mount an optic and a Vortex Diamondback HP, 4 x 16 x 42, in Leupold QRW mounts got the nod.
This rifle/scope combination, with the appropriate load for the Sierra 165 Sierra Game King, has proven extremely accurate and effective on deer and coyotes. The Sierra 168 BTHP match bullets provide impressive MOA and sub-MOA groups at and beyond 100 yards.
Enjoy the rifle, you made a great choice!