The Brownells Holosun 507k Cut Slide for the Sig P365 enables you to install a Holosun 407k, 507k, and Shield Sight RMS red dot sight on your pocket Sig P365. It offers all the benefits of our "Front Cut" slide for Sig P365, including forward slide serrations that give you extra leverage in manipulating P365 slide against its stiff recoil spring. The cutout on top of the slide behind the ejection port accepts a Holosun 407k, 507k, and Shield Sight RMS or other red dot that fits the Holosun 407k/507k mounting footprint. Threaded 6-32 tpi and uses the factory screws supplied with your Holosun 407k or 507k The Holosun 507k Cut Slide for Sig P365 also comes with a factor Mfg: Brownells