I purchased a new DPMS Oraclel in .308 I have installed SUREFIRE - AR-15/M16 M73 PICATINNY RAIL FOREND now I want to put on some glass. Can I get decent glass this for around $150-$200 not counting rings? I am looking to shoot distance of 100 to 150 yards. I would also like to put sights on the side of the rails if that is possible? If so what would I look for?