3 Best FN 503 Lights

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I’m an experienced shooter with countless hours on the range and in the field. I’ve had the pleasure of hands-on testing FN 503 and different weapon lights. 

After much consideration, I’ve found that the Streamlight TLR-1 HL is my top choice for a light attachment on this particular model.

A reliable light is an essential accessory for any firearm owner. It helps enhance your vision in low-light conditions and can be crucial for both safety and accuracy. 

With so many options on the market, it’s easy to get lost. This article is designed to help you cut through the noise and choose the light that’s best for you and your FN 503. 

Best FN 503 LightsCategoryPrices
Streamlight TLR-1 HLTop Pick$141.38
Streamlight TLR-7ABest Performance$121.63
SureFire X300 UltraBest for Tactical Use$288.00

Top 3 Best FN 503 Lights

1. Streamlight TLR-1 HL – Top Pick

The Streamlight TLR-1 HL is a high-lumen tactical weapon light designed for peak performance under extreme conditions.

Powerful Illumination: This light packs a serious punch with its 1000 lumens and 20,000 candela peak beam intensity. In simple terms, it turns night into day. 

You’re not just getting a light; you’re getting a mini-sun attached to your firearm. At a 283-meter beam distance, this light isn’t playing around. 

Its extensive reach means you can spot objects from a great distance, providing a strategic advantage.

White LED Technology: Alright, this feature is a gem. The light uses White LED technology that’s impervious to shock, boasting a 50,000-hour lifetime. 

That’s a lot of durability right there. It also means that the LED won’t give up on you in the middle of anything important. This tech ensures that your light remains consistent throughout its life, removing any worries about degradation or faltering illumination.

Build and Durability: Solid as a rock, folks. The body is made from durable aluminum and comes with an anodized finish. 

The lens? Impact-resistant Boro Float glass that can withstand high temperatures. And get this: it’s IPX7 waterproof, so the light won’t let you down even if you find yourself in wet conditions.

User-Friendly Design: The engineered optic of this light is something to behold. It produces a concentrated beam with optimum peripheral illumination. 

What that means is while the light focuses on your target, it also gives enough light around the area so you’re not blindsided. Plus, it runs for a consistent 1.5 hours, thanks to solid-state current regulation.

Why I Love It: It’s the epitome of tactical efficiency and reliability. From its high lumen output to its robust construction, it fulfills every expectation I had.

My Experience 

The Streamlight TLR-1 HL fits perfectly on my FN 503, like a match made in heaven. Its brightness, build, and overall performance have made it an indispensable part of my gear.


  • Exceptionally bright with 1000 lumens
  • Rugged and durable construction
  • Versatile, thanks to the broad operating temperature range
  • Reliable White LED technology
  • IPX7 waterproof rating


  • 1.5-hour runtime may require carrying extra batteries for extended use

2. Streamlight TLR-7A – Best Performance

Okay, let’s dive in. The Surefire X300 Ultra is a 500-lumen weapon light that provides unbeatable reliability and performance, specially crafted for real-world conditions.

Optics: Let’s talk optics. Engineered to perfection, the optic focuses the light into a concentrated beam that also provides ample peripheral light. 

This means you can focus on what’s ahead while still being aware of what’s happening on the sides.

Build Quality: This is a beast, folks. Crafted from durable, anodized, machined aluminum, this light feels sturdy. Plus, it’s IPX7 certified, making it waterproof up to 1 meter for 30 minutes. 

User Controls: Now, here’s the cherry on top. It comes with a high switch (mounted) and a low switch, giving you control based on the situation. 

You get a CR123A lithium battery and a key kit right in the box. Convenience? Check.

Safe Off Feature: Last but not least, the Safe Off feature prevents accidental activation. It’s like having a bodyguard for your battery, ensuring you won’t find yourself in the dark when you need light the most.

Why I Love It: It’s dependable, versatile, and built like a tank. This light has proven itself on the field time and again.

My Experience

The Surefire X300 Ultra sits snugly on my FN 503 like it was meant to be there. In field tests, it performed brilliantly, the beam was crisp, and the peripheral illumination made a huge difference in tactical situations.


  • Superb build quality
  • Effective Safe Off feature
  • Great beam clarity and peripheral illumination
  • IPX7 waterproof
  • Versatile user controls


  • 500 lumens might not be enough for some users

3. Surefire X300U – Best for Tactical Use

Surefire X300U is a 600-lumen off-white LED weapon light designed for optimal human vision and your FN 503.

LED Spectrum: The special off-white high-performance LED isn’t your everyday LED. It’s engineered to produce a yellowish-green light spectrum, ideal for human eyes. 

What’s the big deal? Well, it helps you identify colors and shapes better, crucial for discerning friend from foe or noticing subtle changes in your environment. This kind of thoughtfulness can make or break a tactical situation.

Precision TIR Lens: the lens on this thing is something else. It creates a tight, smooth beam but still manages to offer surround light for peripheral vision. 

So, you’re not just getting a laser-like focus on your target; you’re also able to be aware of what’s happening around you. I’ve found that’s essential in the field, trust me.

Switching Mechanism: Switching modes is easy with its one-finger ambidextrous momentary and constant-on switching. 

That’s a long phrase to simply say it’s super user-friendly. Whether you’re left-handed or right-handed, the intuitive design works for you. No fumbling around when milliseconds count.

Built Tough: Oh, you’ll appreciate this: the aerospace aluminum body is Mil-Spec hard anodized. Yeah, you heard right, aerospace aluminum. 

This thing is built for extreme durability and can withstand some harsh conditions. 

Why I Love It: Its thoughtful design and unparalleled reliability make this more than just a weapon light; it’s your dependable partner in the field.

My Experience 

I’ve had the Surefire X300U on my FN 503, and it’s become an integral part of my gear. From low-light indoor settings to nighttime outdoor scenarios, it’s never let me down.


  • Exceptional LED spectrum designed for human vision
  • Precise and smooth TIR lens for targeted and peripheral illumination
  • Ambidextrous and intuitive switching
  • Extremely durable aerospace aluminum body
  • Worth the price for the quality you get


  • Pricier than other options

Final Verdict

After rigorous testing and evaluation, I can say with utmost confidence that weapon lights are not just an accessory but a necessity, especially for the FN 503. 

My top choice is the Streamlight TLR-1 HL. Now, I didn’t come to this conclusion lightly. I put all these lights through the wringer to make sure they could handle what the real world throws at them. 

At the end of the day, the ‘best’ light boils down to personal needs and preferences. But if you’re looking for a light that brings a balanced mix of brightness, robustness, and reliability, the Streamlight TLR-1 HL is hard to beat. 


How many bullets does an FN 503 hold?

The FN 503 comes with two magazines: a six-rounder for better concealment and an eight-rounder for a more comfortable grip.

How big is the FN 503?

The FN 503 has a 3.1-inch barrel, a 5.9-inch overall length, and a height of 4.6 inches with the flush-fit magazine. Its width is 1.1 inches.

What caliber is the FN 503?

The FN 503 is a 9mm pistol with a weight of 21 oz and a trigger pull of 5.25 lbs.

Does the FN 503 have a safety?

The FN 503 has three passive safeties and does not feature a manual safety.

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I quit my job as a high-powered lawyer to pursue the outdoors. I spend most of my time fishing and hunting but am also an avid shooter with two years experience writing about firearms related topics.