Factory replacement for the P365-XMACRO grip module. It features a true 1913 accessory rail and three interchangeable backstraps (S, M, L) to ensure a proper fit for the user's hand. The medium backstrap comes preinstalled. Compatible with the 17-round P365-XMACRO magazine. Compatible with all P365 FCUs (firing control units) except manual safety versions. Note: A compatible slide assembly (P365XL or XMACRO length) and magazine must be used.