All right everyone, today we’re going to break down the FN 509 tactical. The first thing you’re going to do is drop the magazine out of your firearm and rack that slide to the rear. Make sure chamber and magazine well are empty.
To break this down, the first thing you’re going to want to do is unscrew the thread protector. Now there is an o-ring on one side. The o-ring is on the opposite side of the barrel. When you go to put the thread protector back on you need to check where the o-ring was placed inside the protector, the o-ring should be on the inside of the thread protector and put it on the barrel the opposite way.
Take your takedown lever to 90 degrees, hit your a slide release, pull your trigger in a safe direction, and then slide your slide off your firearm. Now all you have is the frame.
All right, now that we got the slide separate, we’re going to take out your dual recall spring. All you do is push down the spring and pull out. Then you got your barrel. Since your thread protectors off, you can easily slide that off. If you did not take off your thread protector, that barrels not moving.
And then if you were going to be installing an Rmr, you’d pop off the two screws on top of the slide. The FN 509 comes with mounts inside of the case, thrown those mounts for whichever Rmr or red dot you’re going to be installing. Put the screws back on, and you’re ready to rock and roll.
After you’ve cleaned and oiled it up, go ahead and slide your barrel back in. Put that dual recoil spring back in, and line up the rails. Slide her all the way back. Lock her back to the rear, flip it back over, push your lever back up, and thread on your a thread protector.
Again you’ll see that there’s an o-ring on the inside of this. Face that out and then thread that back on. The o-rings are super helpful because that way you don’t have your thread protector fallen off while you’re at the gun range shooting this thing, which is nice.
So once that’s on, go ahead and drop the slide, make sure it fires, and make sure you got that trigger reset.
Pretty simple breakdown of the 509 tactical. They made it real simple for everyone.