What sort of distances are you trying to achieve. The AR can reach out to 400-500 meters and still be effective, provided you are shooting the right loads and have a decent optic.
Instead of rushing out and buying a new rifle, try a different optic and heavier 6O-68 grain bullet. (you will most likely get better accuracy out of the 60's because of the 1/9 bbl twist rate that you have.)
Here is just a suggestion on an optic and mount that may help shoot very accuratly out to 350-400 meters. A Millet DMS 1-4x varible power optic and a larue mount for your flat top
Millet 1-4X24 DESIGNATED MARKSMAN Tactical SCOPE (DMS)
LaRue Tactical SPR-E Scope Mount QD LT-139
A Second (some what cheaper) Mount
American Defense RECON X Extended Scope 1 inch rings
Remember this is just an option, it may be a little on the expensive side (approx $465) but its cheaper than buying a whole new rifle and optic combo.