Need scope ( preferably) or other sight for shots at 10 yards

Here is the Vortex Crossfire on an AR-15 that I built myself using a Spikes Tactical lower receiver. 

Here is the Crossfire on my Daniel Defense AR-15. Can you tell I like the Crossfire?

A couple more things, if you decide to go with the Vortex Crossfire, make sure you get a gen 2 model. It will have the battery life listed at 50,000 hours and is night vision compatible. The first gen didn’t have night vision compatibility and the battery life was much lower at 7,000 hours. The hours listed is with the site turned on with a medium brightness setting. You also receive a nice Weaver/Picatinny mount on the red dot with two different height choices so no need to buy a mount. You will need a dovetail to Picatinny adapter if your rifle came with the dovetail receiver but everything else needed is included.