Eotech 555

Just ordered an Eotech 555. First Eotech. Do I need a riser for this or does it come included? Just trying to get an idea of what I need to have on hand when it arrives.

Thanks!

Well first I guess saying the 555 has built in ARMS levers takes care of mounting to the rail. As far a riser, mount it, go out and shoot it and then adjust with a rail spacer if wanted.