The FN 509 Tactical from FN America has been a big success for the company. Offering shooters a striker-fired pistol filled with features from the get-go. The Tactical series from FN includes threaded barrels, optic-ready slides, and suppressor-height sights. Now, FN is offering that same feature set in two new big-bore pistols. FN America is proud to announce the FN 510 Tactical chambered in 10mm and the FN 545 Tactical chambered in .45 ACP.