SIG Sauer P365-FUSE - 9mm w/ Holosun 507K For sale is a SIG Sauer P365-FUSE chambered in 9mm, equipped with a Holosun 507K red-dot optic. This is a nicely equipped example of SIG's full-size P365 variant, combining the slim profile of the P365 platform with the longer FUSE configuration. This package includes two 10-round magazines, one 21-round magazine, and a holster, giving the next owner a well-rounded setup right out of the box. The addition of the Holosun 507K provides a quality optic setup and adds significant value to an already impressive pistol package. A sharp, well-equipped P365-FUSE package complete with Holosun 507K, three magazines, and holster. An excellent option for anyone looking for a modern, optics-equipped SIG P365.