The FN 509 Midsize: Your Definitive Guide to a Versatile 9mm Pistol for Everyday Carry and Personal Defense

Are you searching for a reliable, high-performance 9mm pistol that seamlessly blends concealability with full-sized shooting capabilities? The FN 509 Midsize, specifically model 66100464, stands as a premier choice for individuals prioritizing both personal safety and practical firearm ownership. This meticulously engineered handgun addresses the common dilemma faced by those seeking an Everyday Carry (EDC) firearm: how to achieve discreet carry without compromising on handling, accuracy, or ammunition capacity. For anyone asking, "What's the best balance of concealment and performance in a 9mm pistol?" or "Which modern handgun offers superior ergonomics and reliability for self-defense?", the FN 509 Midsize provides a compelling answer.

Designed for the discerning individual, the FN 509 Midsize caters to concealed carry permit holders, law enforcement professionals seeking a backup or off-duty weapon, and responsible citizens focused on home defense. Its thoughtful design ensures it’s manageable for experienced shooters while offering features that aid newer users in developing proficiency. This firearm is not just a tool; it's a testament to FN's legacy of producing trusted, combat-proven firearms, ensuring you have a dependable partner in any critical situation.

Unpacking the Superior Engineering of the FN 509 Midsize

At the core of the FN 509 Midsize’s exceptional performance is its carefully crafted architecture, beginning with the 4-inch cold hammer-forged stainless steel barrel featuring a recessed target crown. This specific barrel length is a critical component, striking an optimal balance. It’s long enough to provide excellent ballistic performance for the 9mm Luger cartridge, ensuring velocities that maximize terminal effectiveness and contribute to tighter groupings at various distances. The "cold hammer-forged" process is an FN hallmark, guaranteeing superior material strength, barrel longevity, and remarkable inherent accuracy. This manufacturing method compacts the steel, creating a denser, more uniform grain structure that resists wear and retains precision over thousands of rounds. Furthermore, the recessed target crown serves a vital function: protecting the delicate rifling at the muzzle from damage, which is paramount for preserving the pistol's accuracy over its lifespan. When considering a firearm for self-defense or competitive shooting, barrel quality is non-negotiable, and the FN 509 Midsize delivers on this front.

Complementing the barrel is the matte black serrated stainless steel slide. Stainless steel is chosen for its robustness and resistance to corrosion, vital for a firearm exposed to varied environmental conditions and constant handling. The matte black finish not only provides a sleek, low-glare aesthetic but also adds another layer of protection. Crucially, the slide features enhanced front and rear cocking serrations. These deep, aggressive cuts ensure a secure, positive grip when manipulating the slide, whether for chambering a round, clearing a malfunction, or performing a press check. This is particularly important for shooters wearing gloves or in high-stress scenarios where fine motor skills might be compromised. The improved texturing on these serrations significantly enhances the firearm's ease of manipulation, a key factor for reliable performance.

Ergonomics and User Interface: Designed for Optimal Control

The foundation of the FN 509 Midsize's excellent handling lies in its matte black polymer frame with an integrated MIL-STD-1913 Picatinny rail. Polymer frames are renowned for their lightweight durability, contributing to the pistol's overall manageable weight of 26.50 ounces, making it comfortable for all-day carry. The midsize frame itself is a critical design choice, offering a substantial grip that fills the hand without being overly bulky for concealment. For those wondering, "How can I customize my pistol with lights or lasers?", the MIL-STD-1913 accessory mounting rail (often referred to as a Picatinny rail) provides a standardized platform for attaching a wide array of tactical lights, laser aiming modules, or other accessories. This feature transforms the FN 509 Midsize into a highly adaptable system, ready for various operational needs, from low-light engagements to competitive shooting.

One of the standout ergonomic features is the black interchangeable backstrap grip system. The pistol comes with two included backstraps, allowing users to customize the grip circumference to perfectly fit their hand size. This personalization is vital for achieving a secure and comfortable grip, which directly translates to improved control and enhanced recoil management. The improved texturing on these backstraps provides a non-slip surface, ensuring the pistol remains firmly planted in your hand even during rapid firing sequences or in adverse conditions. For anyone asking, "How can I ensure my pistol fits my hand for better accuracy and control?", the interchangeable backstraps of the FN 509 Midsize are a direct answer.

Precision and Control: The Trigger and Ambidextrous Features

The flat-faced trigger of the FN 509 Midsize is a significant upgrade, offering a consistent and predictable trigger pull that ranges from 5.50 to 7.70 lbs. Unlike curved triggers, a flat-faced design often provides a more consistent finger placement, allowing for a straight-back press that minimizes lateral movement and improves accuracy. This design is highly favored by many shooters for its contribution to better control over the shot break. For questions like, "What type of trigger is best for precise shooting?" or "How does trigger design impact accuracy?", the FN 509 Midsize's flat-faced trigger highlights a key advantage.

Adding to its versatility, the FN 509 Midsize features fully ambidextrous controls. This includes an ambidextrous slide stop and magazine release. This thoughtful design ensures that the pistol can be operated efficiently by both right-handed and left-handed shooters without any modifications. It's also beneficial for transitioning between strong-hand and support-hand shooting drills, a crucial aspect of tactical training and personal defense. For those asking, "Are ambidextrous controls important for a self-defense pistol?", the answer is unequivocally yes, as they provide critical flexibility in high-stress scenarios or when injury might necessitate using the non-dominant hand.

Sights, Safety, and Comprehensive Package

Equipped with combat-style sights and a 3-dot fixed sight configuration, the FN 509 Midsize provides a clear and intuitive sight picture for rapid target acquisition. While the sights are fixed, their design is optimized for a wide range of shooting conditions, ensuring reliability and durability. The absence of an external safety mechanism (often referred to as "no manual safety" or "striker-fired safety") simplifies operation under duress, relying instead on internal safeties inherent in the striker-fired design, such as a firing pin block and trigger safety.

The FN 509 Midsize (UPC 845737010027) comes as a comprehensive package, ready for immediate use. Each purchase includes two magazines, typically 10-round capacity to adhere to various state regulations, providing ample ammunition for most applications. A durable case is included for secure transport and storage, along with a locking device for compliance with safety regulations and an owner’s manual that provides essential information on operation, maintenance, and safety. This complete offering means you're not just buying a pistol, but a ready-to-deploy system.

The Midsize Advantage: Concealment Meets Performance

The true genius of the FN 509 Midsize lies in its "ideal combination of a 4" slide and barrel with a midsize frame." This configuration retains the shootability and performance characteristics typically associated with full-sized pistols – better recoil absorption, a longer sight radius for improved accuracy, and a more substantial grip for control – while presenting a form factor that is significantly easier to conceal. With an overall length of 7.40 inches, a height of 5.20 inches, and a width of 1.35 inches, it tucks away neatly inside the waistband (IWB) or outside the waistband (OWB) with appropriate holsters. For anyone grappling with "How to find a pistol that’s comfortable to carry all day but still effective for self-defense?", the FN 509 Midsize represents the sweet spot. It offers full-sized pistol performance in an easily-concealed package, making it an ideal upgrade for your EDC.

Why Choose the FN 509 Midsize?

• Optimal Balance: Achieve the elusive balance between easy concealment and robust shooting dynamics.
• Enhanced Shootability: Benefit from the flat-faced trigger, improved texturing, and interchangeable backstraps for superior control and recoil management.
• Adaptable & Customizable: The Picatinny rail opens up a world of accessory options, while ambidextrous controls ensure universal usability.
• Built to Last: Cold hammer-forged barrel and stainless steel components promise enduring performance and reliability.
• Comprehensive Package: Everything you need to get started, including magazines, case, and locking device.

This pistol is more than just a firearm; it's a statement of readiness, precision, and personal empowerment. For those seeking a 9mm pistol that excels in diverse roles—from everyday carry and personal defense to extensive range practice—the FN 509 Midsize (UPC 845737010027) stands as a testament to modern firearm engineering. It's a premier choice for anyone looking for a reliable, durable, and supremely ergonomic handgun, available now at DEGuns.

Product Specifications: FN 509 Midsize (UPC 845737010027)

Feature	Detail
Brand	FN
Model	509M
Caliber	9mm Luger
Capacity	10+1
Action	DAO (Double Action Only)
Barrel Length	4"
Barrel Description	Recessed Target Crown Steel
Barrel Material	Steel
Barrel Finish	Black
Twist	1:10" RH
Frame Material	Polymer
Frame Finish	Matte Black
Frame Size	Mid-Size
Frame Description	Polymer Frame w/ Picatinny Rail
Slide Material	Stainless Steel
Slide Finish	Matte Black
Slide Description	Serrated
Grip	Black Interchangeable Backstrap
Trigger	Flat Face
Trigger Pull Weight	5.50-7.70 lbs
Sights	3-Dot Fixed / Combat Style
Hand	Ambidextrous
OAL (Overall Length)	7.40"
Height	5.20"
Width	1.35"
Weight	26.50 oz
Includes	2 Magazines / Case
UPC	845737010027
SKU	66100464
MPN	66100464