So People are your choices. Smith and Wesson sent me the optics ready with the Crimson Trace optic and no ported barrel & slide. (five out of 5) I have a more expensive AR that's not as good! by Bradford from Norman, OKlahoma on July 16, 2016 To begin with https://smithwessonmp15mp15sporti56542.oneworldwiki.com/5991066/smith_wesson_m_p_15_m_p_15_sport_ii_optics_an_overview