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FN503 laying on a dead tree FN503 side view FN503 oversized control FN503 on some moss
FN503 laying on a dead tree FN503 side view FN503 oversized control FN503 on some moss
  • Great factory sub-compact trigger
  • Very compact and concealable
  • Good ergonomics even with large hands with the extended mag
  • Needs some "breaking-in" to function properly
  • Low capacity standard mags - 6 rounds only
Editor’s Note:

“If you need a top tier CCW, the FN 503 needs to be in the consideration. With an outstanding trigger, great ergonomics, and coming in at a very reasonable price point — this is a gun that simply delivers.” – David Full Review

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Product Description

The FN 503 is a micro-compact pistol that is highly concealable and great for CCW. With FN’s legendary reputation of durability and reliability, the FN 503 delivers accuracy with best-in class metal trigger that breaks at around 5.5lbs, and a snag-free 3 dot sights.

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FN 503 Specs

Barrel Length
Magazine Capacity
6+1-Round, 8+1-Round
Magazine Included
1 x 6-Round, 1 x 8-Round
Magazine Type
9mm Luger
Front Sight
Rear Sight
Overall Length
Stock Material
1.31 lbs

FN 503 Features

Striker Fired
Stainless Steel Slide
Slim frame
Snag free 3 dot low profile iron sights
Includes 6-round and 8-round magazines

By The Numbers - FN 503

It's decent for a 3" barrel
Needed breaking-in but after 100 rounds, this gun runs!
Not many options there
Not bad especially with extended mag. With the extended mag in, this one ain’t half bad. Extra points for the oversized slide release.

Hands-On Reviews & Related Post

FN 503 Variations & Comparables

(2 ratings)
Sig Sauer P365

Sig Sauer P365


The Sig P365 is an impressive micro 9mm with a great track record. This gun is a popular subcompact semi-auto pistol, designed for CCW and self defense. Some of it’s key features include a 10-round capacity, which is higher than many of its competitors, compact and modular, has XRAY3 Day/Night sights providing visibility in low light conditions, and ambi controls. We’ve tested this gun time and time again. As our writer puts it, “The rest of the industry has had a couple of years to catch up but the P365 is still an impressive micro 9mm that is super popular as a CCW option.” – Travis Pike



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(3 ratings)
FN 509

FN 509


The FN 509 is designed to be a duty weapon. This striker-fired 9mm is a nice gun packed with small features that add up to a lot. From interchangeable backstraps to an accessory rail, this gun has enough going for it to justify the price. While not a budget option, it’s a mid-tier that offers reliability and smooth shooting.

The FN 509 is a polymer pistol with a weight of around 26 ounces and a length measuring 7.4 inches. It features a fixed 3-dot sight system with combat-style sights and a capacity of 17 rounds (or 10-round mags available for states that require that). The trigger pull comes in around 5.5 to 7.7 pounds and it feels smooth while shooting. The gun is ambidextrous right out of the box, great for those lefties! The FN is a nice pistol that is worth the money.

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FN 509C

FN 509C


The FN 509C is one of our writer’s (Johnny B) carry gun. According to Johnny, this thing “runs like a Swiss sewing machine.”

Read More

final verdict

“FN never really makes a bad gun and the FN 503 is no exception. Outside of a short break-in period, it has been reliable and great to shoot. The truly amazing trigger makes this a much nicer gun to shoot out of the box than many other options on the market right now.” – David Lane

Video Review of FN 503

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