How to Install a Red Dot on the FN 509

By Jacki Billings

FN rolled out its latest iteration in the FN 509 series, introducing consumers to the MRD Midsize model capable of supporting a red dot. FN does all the heavy lifting in terms of providing what you need to get started – shipping a handy package of mounts, screws and washers ready to pair with some of the most popular pistol red dots on the market.
Guns.com stopped by FN to get the deets from Pistol Product Manager Tom Victa on the best way to install an optic on the FN 509.
Steps to Install an Optic on the FN 509

Field Strip the FN
Use Torx Wrench to Remove Screw on Cover Plate
Use the Mounting Plate to Seat Optic
Reassemble the FN 509

1. Field Strip the FN
To kick off the mounting process, the FN is field stripped. As always, when disassembling any gun, the very first step is to make sure the gun is free and clear of any ammunition. From there, flip the take-down lever switch down, pull the trigger and rock the slide from the frame of the pistol.
2. Use Torx Wrench to Remove Screws on Cover Plate
Once the slide is free from the frame, grab the Torx Wrench

Source: Guns.com