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Go BIG with FN’s 509 Full-Size MRD — SHOT Show 2024 – feed
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Go BIG with FN’s 509 Full-Size MRD — SHOT Show 2024

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Estimated reading time: 3 minutes

Frequently, a full-size handgun is followed by smaller versions as the market demands.

But in the case of FN’s new 509 Full-Size MRD pistol, they’ve now released a full-size version of their popular compact 509. Originally for law enforcement, now everyone has access.

Now available in a full-size frame with a 4.5″ barrel.

The Full-Size MRD has a 4.5″-long barrel which makes a longer sight radius for more accuracy. Also, the grip is taller and it takes 17-round mags.

Close up view of the back of the magazine showing the holes for each round. The 509 is in the background.
This larger 509 takes 17-round mags.

Surprisingly, suppressor-height sights are standard, as is the optics-cut slide that works with all the major optics. Not surprisingly, interchangeable grip straps are included, too. What aren’t they including with this gun?

Close up of the rear sights which are blacked out and serrated. There is a red dot  on top of the slide.
Suppressor-height sights and optics cuts are standard.

Its double-action trigger weighs-in between 4.5 and 6 lbs., and the gun is striker-fired.

Close up view of the trigger.
It’s double-action and striker-fired.

Unlike other guns that are ambidextrous-friendly with magazine releases that can be swapped to one side or the other, the 509’s release and slide catch are ambidextrous out-of-the-box.

The magazine release is ambidextrous – not just swappable.
Close up view of the left side controls. The gun is pointed to the left.
The slide catch is also on both sides of the frame.

FN’s 509 Full-Size MRD is available now in black or tan, and the MSRP starts at $899.

Close up view of the right side of the gun. The slide is open and the ejection port is revealed.
The 509 is chambered for 9mm.

Specs

  • CALIBER: 9mm
  • OPERATION: Double-action, striker-fired
  • MAG CAPACITY: 17 Rd.
  • WEIGHT: 27 oz.
  • BARREL LENGTH: 4.5″
  • OVERALL LENGTH: 7.9″
  • TWIST RATE: 1:10″ RH
  • HEIGHT: 5.56″
  • WIDTH: 1.35″
  • TRIGGER PULL: 4.5 lb. -6.0 lb.
  • SIGHT RADIUS: 6.3″

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