Hi Van, includes a Viper red Dot, (1)12rd, (1) 24rd magazine, two interchangeable backstraps, locking device, and soft case.
Stay safe & have a great day!

This model includes 2 magazines.
(1)-12 round
(1)-24 round

1 (12) and 1 (24) round mags see ******Full-size punch in a compact package with fn’s patented low-profile optics mounting system and unparalleled modularity of the fn 509 platform, the fn 509 compact tactical.The pistol is 9mm and striker-red with 4.32″ barrel and the capability to accept all higher capacity fn 509 magazines.The patented fn low-profile optics mounting system accepts nearly all commercial miniature red dot optics and features blackout iron sights that co-witness.Includes a viper red dot, *****12rd magazine and a 24rd magazine.
Frame Finish: Flat Dark Earth
Action: DAO
Caliber: 9mm Luger
Barrel Length: 4.32″
Capacity: 12+1
Safety: Loaded Chamber Indicator
Grips: FDE Textured w/Interchangeable Backstrap
Sight Configuration: 3-Dot Night/Suppressor Height
Slide Description: Optic Cut/Serrated

Hi Van and welcome. Only (2) magazines, a 12-round magazine and a 24-round magazine are included. Cheers and stay safe!