Buying accessories for AR15?

Just bought a Ar-15 last week. So far i have not yet had a chance to take it to the range but i have bought a MBUS Rear sight. Was wondering if anyone recommended any particular bipod, scopes, sights, etc. The gun is a Del-Ton Echo 316 OD Green with magpul. It has a Flat Top with M4 Feed Ramps.
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