Owner’s Manual 2020

1
CONTENTS PAGE
1. Foreword ...........................................................2
2. Basic safety rules ............................................ 3
3. Ammunition ...................................................11
4. Dry firing & “dummy” rounds .......................13
5. Nomenclature .................................................14
6. Loading and unloading .................................18
6.1 Loading the magazine .......................... 18
6.2 Loading the pistol .................................19
6.3 Unloading .............................................21
6.4 Unloading the magazine ......................23
7. Firing .........................................................24
7.1 Reloading during firing ........................25
8. Function of the FN 503 .................................. 26
8.1 Firing cycle ............................................ 26
9. FN 503 features .............................................27
9.1 Passive safety systems ........................27
9.2 Slide stop .............................................. 28
9.3 Magazine release .................................29
9.4 Loaded chamber indicator ...................30
9.5 Magazine ..............................................30
9.6 Chassis design
and interchangeable grips .........................31
10. Sight alignment ........................................... 31
11. Disassembling and
reassembling the pistol ..................................... 32
11.1 Field strip (disassembly for normal
maintenance) .............................................. 32
11.2 Reassembly from the
field stripped condition...............................35
11.3 Grip removal .......................................38
11.3.1 Installing the slide stop spring,
trigger bar, trigger bar spring and
disconnect lever ...............................39
11.3.2 Installing the chassis
assembly in the grip assembly .......41
11.4 Magazine disassembly ....................... 42
11.4.1 Magazine reassembly ..........43
11.5 Removing the magazine release ........44
11.5.1 Installing the
magazine release ............................45
12. Cleaning and lubrication.............................46
12.1 Cleaning and lubrication
before firing.................................................48
12.2 Cleaning and lubrication
after firing ................................................... 50
13. Schematic and parts list ............................52
13.1 FN 503 standard model .....................52
14. Warranty, service and
technical questions............................................56
15. Technical specs ..........................................58
16. LaserMax Flashlight Grip ...........................59