"Patterned after its ""big brother"" the FN 509 the FN 502 MRD Semi-Auto Pistol is both a fun plinker and a serious training tool. Matched design ergonomics between the 509 and 502 make live-fire defensive training as realistic as possible they even fit in the same holsters. The slide features FN's Low-Profile Optics-Mounting System, which accommodates a wide range of popular micro red dots. 4"" barrel with target crown for enhanced accuracy. Best-in-class trigger breaks clean at 5 lbs. Single-action only. 3-dot sights. Loaded chamber indicator. Ambidextrous controls. Patterned after the FN 509 Low-Profile Optics-Mounting System 4"" barrel with target crown Best-in-class trigger breaks clean at 5 lbs. 3-dot sights Ambidextrous controls Single-action only trigger"