This factory replacement, P320 RXP X-series Stainless Steel slide assembly fits Full, Carry and Compact size grip modules. It accommodates the 3.6" barrel. This slide comes with the Romeo1Pro mounted on top, ready for use and is equipped with suppressor height, X-ray night sights. *Note, only for use on 9mm/ .357SIG / .40S&W firing control units (FCU). It will not function with a .45 ACP FCU.