I recently completed a stripped Gen 2 Noveske Chainsaw Grade lower and topped it off with a BCM mid-length upper with a Centurion Arms rail. For my optic I chose both a Trijicon ACOG (the compact 1.5 X 16S, see here) or a short base EOTech (see here). A good looking, well set up AR with optics, Made In The USA! For white light, I mounted a Surefire X300 Ultra. Fits and looks good, and is lightweight . . . I even like the way the activation switches work, except for one issue, see below. (Prior Jerry Jones MSW post about the Surefire is here).