Description
FN 66100383 509T 9mm Luger 10+1 4.50″ Black Steel Threaded Barrel, Flat Dark Earth Optic Cut/Serrated Stainless Steel Slide, Flat Dark Earth Polymer Frame w/Picatinny Rail
The FN 66100383 509T 9mm Luger 10+1 4.50″ Black Steel Threaded Barrel, Flat Dark Earth Optic Cut/Serrated Stainless Steel Slide, Flat Dark Earth Polymer Frame w/Picatinny Rail is a striker-fired pistol built on the proven architecture of the FNS Compact. It features a cold hammer-forged stainless-steel barrel with a recessed target crown and polished chamber and feed ramp. The polymer frame has an enhanced grip texture for faster follow-up shots in all conditions, a MIL-STD-1913 accessory rail, and interchangeable backstraps. This striker-fired double action pistol has an external extractor, loaded chamber indicator, and no manual safety. It is equipped with a fully ambidextrous slide stop lever and magazine release.
| Manufacturer | FN America |
|---|---|
| Model | 509T |
| Material | Cold hammer-forged stainless steel barrel, stainless steel slide, polymer frame |
| Compatibility | 9mm Luger |
| Finish | Flat Dark Earth (frame and slide), Black (barrel) |
| Weight | 26.3 oz (per manufacturer specs) |
| Condition | New |
Key Features
- Optic-Cut Slide: Why it matters: You can mount a red dot sight directly onto the slide without using an adapter plate, giving you a lower profile and faster target acquisition.
- Threaded Barrel: Why it matters: The 1/2×28 threaded barrel lets you attach a suppressor or compensator, making this pistol ready for quiet shooting or reduced muzzle rise right out of the box.
- Enhanced Grip Texture: Why it matters: The aggressive texturing keeps the pistol firmly in your hand even when wet or sweaty, so you can shoot more accurately and confidently during training or in defense situations.
- Fully Ambidextrous Controls: Why it matters: Both left-handed and right-handed shooters can easily operate the slide stop and magazine release, making this a great choice for families with multiple shooters.
- Interchangeable Backstraps: Why it matters: You can adjust the grip to fit your hand size, which helps new shooters maintain a proper hold and improves overall control.
Who It’s For
This FN 509T is built for families and beginner shooters who want a reliable, easy-to-use handgun for home defense, range practice, or starting their collection. The no-manual-safety design and ambidextrous controls make it simple for everyone in the household to learn and shoot safely. The Flat Dark Earth finish also looks great in any safe or range bag.
Pros and Cons
- Pros: Reliable cold hammer-forged barrel, factory optic cut saves money on gunsmithing, threaded barrel for suppressors, comfortable grip for smaller hands, ambidextrous controls.
- Cons: The trigger has a slightly longer reset than some competition models—something newer shooters may notice during rapid fire drills.
Comparison: FN 509T vs. Zev Technologies OZ9 vs. Agency Arms AOS G19
| Feature | FN 509T | Zev Technologies OZ9 | Agency Arms AOS G19 |
|---|---|---|---|
| Price | $833.53 | ~$1,100 | ~$1,500 |
| Optic Cut | Factory direct | Factory direct | Factory direct |
| Barrel | 4.50″ threaded | 4.49″ threaded | 4.02″ threaded |
| Capacity | 10+1 | 17+1 | 15+1 |
| Frame | Polymer | Polymer | Polymer |
| Best For | Budget-conscious families | Competition shooters | Custom builders |
According to FN America specs, the 509T is tested to function with a wide range of 9mm ammunition, including 124-grain NATO loads commonly used in training.
FAQ
Does this pistol come with a manual safety?
No, the FN 509T does not have a manual safety. It relies on a striker-fired double-action trigger system with an internal safety block. Always keep your finger off the trigger until ready to shoot.
Can I use this with a suppressor?
Yes, the 4.50″ barrel is threaded 1/2×28 and is designed for suppressor use. The factory optic cut also allows co-witnessing with suppressor-height sights.
What backstraps are included?
The pistol comes with three interchangeable backstraps (small, medium, large) to fit different hand sizes. Medium is pre-installed on the frame.
Is this legal in my state?
This pistol ships with a 10-round magazine, making it compliant in most states with magazine capacity restrictions. Check your local laws before ordering.
How do I clean the threaded barrel?
Use a standard 9mm cleaning kit. Apply a light coat of gun oil to the threads after cleaning to prevent corrosion, especially if you shoot suppressed.
Why Buy from Us
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Explore more options: Semi Auto Handguns | FN Handguns | 9mm Pistols
Last updated: April 2026
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