FN 509 Tactical 9mm FDE Threaded Barrel 509T Night Sights 66-100373

Out of Stock


FN 509 TACTICAL 9MM FDE 24+1 NIGHT SIGHTS THREADED 509T 66-100373. Comes new in the box. Many customers choose to mount a red dot sight on this 509 Tactical.


The FN 509® Tactical, an extension of the FN 509 family, is based on FN’s submission pistol that the U.S. Army tested for its Modular Handgun Trials, but includes the significant improvements to the design that were implemented in the FN 509. The pistol features the company’s U.S Patent No. 10/352,654 Low-Profile Optics Mounting System™ that enables the platform to accept more than ten commercially-available miniature red dot (MRD) optics that co-witness with the suppressor-height night sights and remain adaptable to future optics releases with no requirement of direct milling of the slide. The slide cap, for use when not shooting with an optic, has raised sight wings that protect iron sight alignment if the pistol is dropped or jostled, and provides a textured ramp for racking the slide against a belt loop, pant pocket or boot. An FN-signature 4.5-inch, cold hammer-forged, stainless-steel barrel with target crown, ½” x 28 threads that accept the bulk of 9mm suppressors available and thread cap with integrated O-ring to prevent loosening during use complete the top end. Lastly, the 24-round magazines, nearly identical in length to the pistol’s slide, maximize ammunition capacity without impacting carry convenience.



  • Caliber: 9mm
  • Operation: Double-action
  • Mag Capacity:  17/24 Rd.
  • Weight: 27.9 oz.
  • Barrel Length: 4.5"
  • Overall Length: 7.9"
  • Twist Rate: 1:10" RH
  • Height: 5.75"
  • Width: 1.35"
  • Trigger Pull: 5.5 - 7.5 lb.
  • Sight Radius: 5.79"

Primary Features

Striker-fired autoloader

5.5 to 7.5 lbs. Trigger pull

FN Low Profile Optics Mounting System™ (U.S. Patent No. 10/352,654)

Threaded Barrel

Suppressor Height Trijicon 3-Dot Green Tritium Night Sights



FN Low Profile Optics Mounting System™ (U.S. Patent No. 10/352,654)

Sight Protecting Slide Cap

External extractor; loaded chamber indicator



Cold hammer-forged stainless steel

Recessed target crown

Polished chamber and feed ramp

1/2” x 28 threaded Barrel

O-Ring retention thread cap



Polymer construction with replaceable steel frame/slide rails

Enhanced grip texture which enables faster follow-up shots in all conditions

Interchangeable backstraps

MIL-STD-1913 accessory mounting rail



Fully ambidextrous slide stop lever
and magazine release



High visibility, low-friction follower;
polymer base with black finish



Two interchangeable backstraps

Two 17-round magazines

Owner’s manual

Locking device

FN logo soft pistol case


Condition: New
Manufacturer: FN America
Model: FN 509 Tactical
Caliber: 9mm Luger
SKU: 845737009137
MPN: 66-100373
UPC: 845737009137
Vendor: Gunprime
Reviews (32)
By TX Red on 10/11/22
Excellent handgun from a great seller

If you're even considering the FN 509 Tactical, you likely know what you're getting - this is probably the best out-of-box duty pistol on the market once you consider its optic mounting system (probably the best optic system currently on the market), threaded barrel, suppressor-height Trijicon night sights, multiple recoil springs (for reliable functioning when suppressed or compensated) and outstanding capacity (17 rds standard, 24 round extended optional magazines). The trigger is crisp, if heavy, and I decided to replace the factory striker with a striker from APEX, but I couldn't be happier with this handgun. For $800 or less, I don't think there's another handgun on the market that's as feature-rich.

I fully recommend this gun and this seller. I had a very minor issue with my order, and customer service was friendly and quick to resolve the issue the moment I called in. They ship quickly, treated me well, and offered a price that was well below what anyone in my local area could match. Buy with confidence.

By Chief on 08/11/22
Love it

Shoots like a dream

By Lee on 05/14/22
Fast shipping!!

Called to check shipping and was told if I purchased that day that they could ship same day and they did! Very pleased with Gunprime definitely would use them to purchase my next firearm.

By Amazing on 05/14/21

I love this firearm 💯💯💯💪🏾💪🏾💪🏾

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By Jake on 04/27/21
Best gun buying experience I’ve ever had online.

Gunprime shipped my order out within an hour of me placing the order. I called them twice for information about the gun and each time I spoke with someone very helpful without having to go through some automated phone system. I’d definitely buy from them again. The gun is awesome too.

By Dan Rowley on 04/16/21
Lightning shipping

My order was shipped within hours and arrived in less than a few days. Weapon box was in a sealed wrapper for peace of mind to boot. This is my new local gun store, they have better prices and don’t force me into a mask while I shop online from the comfort of my own phone anywhere or time I please. I’ll be making another purchase very soon with the savings, it’s already sitting in my cart just waiting for me send it. Customer service responded to my email same day, who does that anymore? I’ve made a lot of purchases in the last year and this is the only one I’ve been bragging about.

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By John s on 12/16/20
I was very happy with the 509 , shoot good right out the box

I want definitely buy it again, great pistol

By MJS on 11/25/20
One of the most complete pistol packages on the market

There are numerous reviews out there for this gun, most of which are glowing. They’re all correct. The threaded barrel, optics-ready system, accuracy, and included mags are amazing.

However, I’d like to address a nagging issue that I learned about when purchasing, as this was one aspect that almost kept me from buying the pistol. It’s to do with the factory striker, which had been known to cause issues and fail due to “primer drag.”

This is remedied by a $50 Apex Striker, which I ordered and which is extremely easy to install with basic tools. Initially I hated the thought of having to pour even a little more money into a $900-plus gun, but when you weigh all the features of the 509 tac, it’s a cheap price to pay for piece of mind when you consider how much you’d have to fork over to get other guns up to the speed and features that are standard here.

I was also wary of the break-in period some say is required and jams/misfeeds associated with it. Also not okay in my book. So I’ll admit I took a bit of a gamble here and expected to have to work to get this thing up to snuff and reliable.

I’m glad I did. This thing shoots like a dream and checks every box for me. Suppressor ready, high cap mags, high sights and real tack driver.

Just a tip, when I received the gun, the recoil spring was extremely stiff and the gun was full of more than the usual amount of factory grease and gunk. Clean it well—clean it correctly—and leave the slide locked back and mags loaded for a week or so before breaking in. I’m almost positive this is responsible for almost all those misfeeds and hang ups mentioned earlier.

I’ve had zero issues with this gun since then and put 300 rounds through it over a few hours. It only got better from there. Although I plan to eventually install the apex trigger, I don’t see what the trigger criticisms I read are all about. Slightly long on the first round (which I view as a pro) and a nice, short, clean reset on follow ups.

Like the headline says: the total package, even if there are some things to watch out for.

By T REX on 09/30/20
Great platform

Optic ready

By Nocturnal Emission on 09/29/20
Fantasy Fulfilled

This gun feels great in the hand. Bright night sights, exchangeable back straps, and holds $373.06 worth of 9mm in a single mag. I run the SC osprey 45 on her and it runs like aunt Jemima's maple syrup, smooth to the last shot.

By Ben on 09/02/20
Couldn’t be happier!

Excellent all the way around. I was able to mount RDS in seconds. Night sights are very nice. Trigger has a crisp break. I was planning on installing an Apex trigger, but that whole process is a nightmare just practice with the factory trigger. Great build FN!

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By John Dunn on 09/01/20
Great company

Very easy transaction and great communication on the firearm.

By John Beck on 08/31/20
Gunprime had it to me as described and on time!

Love it so far.. Second FN and can’t wait to build it how I want.

By David on 08/18/20
Excellent Service

Excellent firearm, and great service during these very difficult and bizarre times in which we live. Thank you for quick, efficient delivery and a seamless ordering process. And thank you for maintaining inventory to help keep America safe!

By Joe d on 08/18/20
GunPrime is very competitive and ships quick!

The gun looks and feels great- have not had a chance to fire it yet!

By Homeboy on 08/10/20
Great gun and fast shipping

Third gun I’ve bought off gunprime. Always fast shipping and good guns.

By FN new guy on 08/06/20

Out of the box, this FN509T is worth every penny. The only downside is the trigger. Not the worst trigger action out there, but not the best either. I threw on a Holosun 507c in green cause my round eyes. The suppressor height night sights are well illuminated and acquisition is quick and easy. I also added an Olight micro Valkyrie. Cycles a variety of mixed 9mm I staggered in the magazines without issues. Wish the mags were a little cheaper, but you get what you pay for.

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By Cocooo on 08/03/20
Best deal out there

Bought it without seeing or holding one in person and I can say this is by far my best purchase especially for the price gunprime has it for. Comes with everything i would ever want on it for $100 cheaper then everywhere else. You cant go wrong

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By Bryan on 07/24/20
FN 509 Tactical

I absolutely love this pistol, it fits in the hand perfectly and has incredibly visible sights. I ended up adding a red dot, and will be adding onto the under rail as well as a suppressor when I can.

I highly recommend this pistol to anyone looking for a high capacity sidearm.

By Izzi on 07/17/20

Shoots great, ergos are good! Best handgun I’ve shot! Put 300+ rounds through it and I couldn’t be happier!

By Gregory on 07/15/20
Low price, as described, and fast!

I purchased a new 9mm FN 509 tactical for $150 under MSRP. Great product, fast shipping, as described, and seamless to transfer. I’ll check GunPrime first, before making any other new weapon purchase.

By Seth R. on 07/08/20
I regret not finding gunprime.com first

Gun was perfect and brand new as expected. But the customer service was the real star of the show here. My order was picked and shipped within hours. It arrived 2 days later. Thank you very much.

Bought a stock FN 509 Tactical in FDE and fully upgraded it.

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By D. Jolley on 06/18/20
Awesome gun

Great gun at a great price. Thanks!

By Race on 06/16/20
great company to buy from

Only have like 200 rounds through it so far. Love how it feels and shoots.

By Kevin B on 06/16/20

Ordered the FN 509 Tac and I couldn’t have asked for a better deal. The pistol came within a week, the complete range package was top quality as was the pistol itself. There was also a mail in rebate for a light attachment that I’m still waiting to receive but Gunprime was incredible when it came to customer service.

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By Teezy on 06/16/20
Great gun and fast shipping

Ordered gun and was delivered in three days. Great customer service.

By TP on 06/15/20
Crazy low price, super fast shipping

This pistol is among the best available in the market today. Many folks point out that the trigger could be better, this is true. However, that's a nit-picky issue and pretty much the only issue that one can reasonably identify. I got this on sale for $[low-price] and at the time it came with a free Streamlight TLR-7A. Unbelievable deal. Gunprime shipped immediately once I provided the FFL info.

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By Jason J. on 06/12/20

Excellent shooting!
I was so very impressed with the FN 509 tactical l had to buy a second.
Aside from the trigger pull it feels smoother than my G19, Sig M11A1 and HKP30S/ VP9.
Great pistol.

By Randy on 06/12/20
This gun comes ready to go!

I was wanting a gun to direct mount an optic. This comes ready mount with several options that will work most any mount. Which is very helpful. Barrel is ready for suppressor. This gun is well thought out.

By Randy on 06/12/20
This gun comes ready to go!

I was wanting a gun to direct mount an optic. This comes ready mount with several options that will work most any mount. Which is very helpful. Barrel is ready for suppressor. This gun is well thought out.

By Art on 03/17/20
FN 509 Tactical FDE 24+1, 17+1

I saw the previous comment for the price that was available and I just had to try it. I was very surprised when I got my email quote for the same [low price]. I couldn't let it pass. 3 days later it arrived at my local FFL dealer. Absolutely love this gun. Thank you GUNPRIME!

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By Shelton on 01/23/20
Amazing Purchase

I have been eyeballing this gun for over a year and here it is at [low price] no taxes and no shipping fees. Just one incredible purchase. I had it within a week and I must say I love this gun and how much the price is. Even the FFL was amazed at the price when I went to pick it up. I definitely recommend GunPrime with any purchase you have, especially this gun.

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