Owner’s Manual 2020

36
The sights of the FN 509 should be aligned with the top of the front sight
even with the top of the rear sight and an equal gap between the rear sight
and the sides of the front sight. The point of impact will be at the top of the
front sight when the sights are properly aligned.
The dots provided on the sights are intended as an aid in low light
conditions and provide a less precise but faster sight alignment.
If installing and using an optical sight, the optic must be zeroed for
accurate targeting.
NOTE: Optical sight zeroing should be confirmed each time the optical sight
is removed. See the sight manufacturer’s instructions regarding zeroing of
your optical sight. Initial alignment can be performed by aligning he optical
reticle with the top of the front sight when the front and rear sights are
aligned.
11. DISASSEMBLING AND REASSEMBLING THE PISTOL
11.1 FIELD STRIP (DISASSEMBLY FOR NORMAL MAINTENANCE)
It is very important to become familiar with the disassembly procedure of
your pistol. Disassembly to field strip level is required for proper cleaning
and lubrication, which ensure reliable operation of the pistol.
1. Completely unload the pistol as described in Section 6.3 and remove
the magazine. Inspect the chamber and the magazine well to verify
that the pistol is completely unloaded (Figure 38).
2. Retract the slide and lock it in its rearward position using the slide
stop (Figure 39).