Good evening to you!! Per the description "The P365 Custom Works Fire Control Unit (FCU) brings an unprecedented level of customizability and personalization to the micro-compact carry platform. From grip modules, magazines, custom slides, barrels, optics, and accessories, you can configure your P365 in thousands of different ways to personally customize your pistol to your specific carry needs." You can also use none SIG Sauer made grip modules that meet the manufacturer specifications. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸