The 545 Tactical is an extension of FN's 509 family aimed at offering users unparalleled customizability that is chambered in the legendary .45 ACP cartridge. The pistol utilizes FN's patented Low-Profile Optics Mounting System to allow for mounting over 10 different types of aftermarket optics through the use of adapter plates. The pistol also includes suppressor-height sights for co-witnessing with a chosen optic along with a slide cap that includes bump wings to protect the rear sight in the absence of a red dot optic. The 545 Tactical series also features a threaded barrel for mounting suppressors and other muzzle devices. This model features an all-black color pattern and includes two magazines (1-15 round; 1-18 round) along with a zippered case, two additional backstraps, and 4 adapter plates for mounting optics.