Now I own one. But need guidance from some good knowledgable folks. Two of us live on a small isolated farm and we wanted a "fire extinguisher". Got a standard XM15 A2S. My reasoning was that weapon looked like it could get banged around without too much going wrong vice having a flattop w/scope where should the scope go out I'd have no sights. However I might want to add-on depending on advice  Should I put on a scope of some kind, nite vision, laser, etc? I appreciate the help.