Owner’s Manual 2020

1
CONTENTS PAGE
1. Foreword ..........................................................2
2. Basic safety rules ...........................................4
3. Ammunition ...................................................11
4. Dry firing & “dummy” rounds ......................13
5. Nomenclature ................................................13
6. Loading and unloading .................................18
6.1 Loading the magazine .........................18
6.2 Loading the pistol ................................20
6.3 Unloading .............................................22
6.4. Unloading the magazine ....................24
7. Firing .............................................................25
7.1 Reloading during firing .......................26
8. Function of the FN 509 .................................28
8.1 Firing cycle ...........................................28
9. FN 509 features ............................................28
9.1 Passive safety systems .......................28
9.2 Manual safety ......................................30
9.3 Ambidextrous slide stop ......................32
9.4 Magazine release .................................32
9.5 Loaded chamber indicator ...................33
9.6 Magazine ..............................................33
9.7 Accessory mounting rail ......................34
9.8 Threaded Barrel.................................... 34
9.9 Interchangeable backstraps ................35
9.10 FN optics mounting system ...............35
10. Sight alignment ..........................................35
11. Disassembling and
reassembling the pistol .............................36
11.1 Field strip ...........................................36
11.2 Reassembly from the
field stripped condition ...................39
11.3 Backstrap removal .............................41
11.3.1 Backstrap installation ........42
11.4 Magazine disassembly ......................43
11.4.1 Magazine reassembly .........44
11.5 FN Optics Mounting System...............45
11.6 Suppressor and muzzle device
installation and use ...........................48
11.7 Removing the magazine release .......50
11.7.1 Installing the
magazine release ............................51
12. Cleaning and lubrication ...........................52
12.1 Cleaning and lubrication
before firing .....................................54
12.2 Cleaning and lubrication
after firing ......................................56
13. FN 509 schematic and parts list ...............58
13.1 FN 509 Standard Model ....................58
13.2 FN 509 Tactical Model
slide assembly unique parts...........62
14. Warranty, service
and technical questions ............................66
15. Technical specs ..........................................68