You’ll find the FN 509 Midsize MRD features a 4-inch barrel with striker-fired action, weighing 26.5 ounces unloaded. It’s chambered in 9mm with 10/15-round capacity and includes FN’s Low Profile Optics Mounting System for red dot sights. The polymer frame offers aggressive texturing for recoil management, while the flatter trigger face ensures consistent performance. Pricing typically ranges $700-900 depending on retailer. This comprehensive breakdown covers everything you need to make an informed decision.
Key Takeaways
- The FN 509 Midsize MRD features a 4-inch barrel, striker-fired action, and integrated Low Profile Optics Mounting System.
- Priced at $834 MSRP with online retailers offering $750-$850 range and auction sites showing $700-$900 pricing.
- Weighs 26.5 ounces unloaded with 10/15-round magazine capacity and 9mm Luger chambering in polymer frame.
- Developed for U.S. Army’s Modular Handgun System competition in 2015, commercially released by FN in 2017.
- Competes directly with Glock 19, Sig P320, and Smith & Wesson M&P9 M2.0 in striker-fired pistol market.
Description
The FN 509 Midsize MRD represents FN Herstal’s striker-fired evolution, featuring a 4-inch barrel with 1:10 RH twist rate and integrated Low Profile Optics Mounting System.
You’ll find enhanced controls and a flatter-faced trigger for improved recoil management. The midsized frame delivers standard 15-round capacity while maintaining compatibility with higher-capacity FN 509 magazines for versatile applications.
Price Range
Most authorized retailers price the FN 509 Midsize MRD at $834.00 MSRP, though you’ll find variations across different purchasing channels. The Midsize MRD features justify this price range through optics-ready capability and enhanced ergonomics.
| Purchase Channel | Typical Price Range |
|---|---|
| Authorized Dealers | $834.00 MSRP |
| Online Retailers | $750-$850 |
| Gunbroker Auctions | $700-$900 |
| Sale Events | $650-$800 |
Pricing and purchasing options include financing plans and periodic discounts.
Specifications
You’ll find the FN 509 Midsize MRD’s specifications reflect its design as a versatile carry pistol with optics-ready capabilities. The pistol’s 4-inch barrel and 26.5-ounce weight provide an optimal balance between concealability and shootability. These core specifications define the firearm’s practical applications and performance characteristics.
| Specification | Value | Details |
|---|---|---|
| Weight | 26.5 oz | Unloaded weight |
| Barrel Length | 4 inches | 1:10 RH twist rate |
| Material | Polymer/Steel | Frame and slide construction |
| Chambered | 9mm | Luger/Parabellum |
| Capacity | 10/15 rounds | Magazine dependent |
Weight
When examining the FN 509 Midsize MRD’s physical specifications, you’ll find it weighs 26.5 ounces with an empty magazine installed. This measurement represents the complete pistol assembly including the polymer frame, steel slide, and 4-inch barrel configuration.
The weight places this midsize platform within standard parameters for polymer-framed handguns, providing balanced handling characteristics for concealed carry applications.
Barrel Length
The FN 509 Midsize MRD features a 4.0-inch barrel length that balances concealment requirements with ballistic performance.
You’ll find this four-inch configuration delivers the same ballistic capabilities as FN’s full-size variant while maintaining the compact profile essential for the midsize platform. The barrel’s optimized length ensures you won’t sacrifice performance for the enhanced concealability this midsize pistol provides.
Material Made Out Of
Built from premium materials, the FN 509 Midsize MRD combines a stainless steel slide with a polymer frame construction. You’ll find the polymer frame features interchangeable backstraps for customized fit.
The frame’s aggressive texturing enhances grip tracking during rapid fire sequences. The stainless steel slide provides a robust mounting platform for optics while maintaining precise tolerances for reliable cycling.
Chambered In
Chambered in the versatile 9mm Luger cartridge, this midsize pistol delivers reliable performance through its 4-inch barrel with a 1:10 inch right-hand twist rate. The FN 509 Midsize MRD’s chambering provides you with proven stopping power while maintaining manageable recoil characteristics.
You’ll appreciate the standard magazine capacity of 15+1 rounds, offering substantial firepower in a compact platform.
Capacity
Standard capacity reaches 15 rounds in the factory magazine, while you’ll find compatibility with higher-capacity FN 509 magazines for extended shooting sessions.
The standard 15-round capacity balances the midsize frame’s concealability with practical firepower. State regulations may restrict magazines to 10-round limits in certain jurisdictions.
This capacity configuration optimizes the pistol’s versatility for concealed carry and defensive applications.
Trigger Pull
The FN 509 Midsize MRD delivers a trigger pull weight ranging from 5.5 to 7.7 pounds, engineered for consistent performance across defensive and target shooting applications.
The flatter faced trigger allows enhanced finger placement while interchangeable backstraps provides better grip alignment. This configuration promotes controllable trigger press mechanics, resulting in improved trigger press and cleaner break characteristics for precise shot placement.
Safety?
Building on the trigger’s reliable mechanics, FN engineered the 509 Midsize MRD with four distinct passive safety systems that operate without manual engagement. You’ll find integrated trigger safety, striker block, drop safety, and trigger disconnect protection.
The improved controls aid ambidextrous operation, while interchangeable backstraps provides better grip customization. Flatter surfaces feature aggressive texturing for enhanced handling security.
Action
Striker-fired operation drives the FN 509 Midsize MRD’s double-action mechanism, delivering consistent trigger pull characteristics in a 9mm Luger chambering. You’ll find the new flatter faced trigger enhances shot control while improved texturing on interchangeable backstraps provides better recoil management.
The action’s reliable cycling supports compatibility with miniature red dot optics through FN’s integrated mounting system.
Optic Ready?
FN’s Low Profile Optics Mounting System transforms this midsize pistol into a versatile optics platform, supporting over 10 different miniature red dot sights without requiring additional plates or modifications.
The 4.0-inch slide integrates the optics mounting package directly into its design. You’ll find this system accommodates various manufacturers’ optics, ensuring compatibility with your preferred sight configuration for enhanced accuracy.
Review
You’ll find the FN 509 Midsize MRD delivers consistent performance through its striker-fired action and 4-inch cold hammer-forged barrel. The pistol’s reliability stems from FN’s military-grade manufacturing standards, though you’ll notice the trigger requires a longer reset compared to premium competition triggers.
Your evaluation should consider the optics-ready platform’s versatility against potential concerns like the grip texture’s aggressiveness and the pistol’s 26.5-ounce weight for extended carry.
Pros
When examining the FN 509 Midsize MRD’s performance advantages, several key features immediately stand out for concealed carry and tactical applications. You’ll find better recoil management through improved texturing on the grip surfaces. The new optics mounting system accommodates 10+ red dot sights. Standard 15-round capacity accepts larger capacity FN 509 magazines for extended shooting sessions.
| Feature | Specification | Advantage |
|---|---|---|
| Barrel Length | 4 inches | Enhanced concealability |
| Weight | 26.5 ounces | Lightweight carry |
| Magazine | 15+1 standard | High capacity |
| Optics Ready | 10+ compatibility | Versatile sighting |
| Frame Size | Midsize | Balanced control |
Cons
While the FN 509 Midsize MRD delivers strong performance characteristics, several drawbacks merit consideration before purchase. You’ll encounter a heavier trigger pull ranging 5.5-7.7 lbs, affecting rapid-fire accuracy. The 26.5 oz weight impacts all-day carry comfort. Its 4-inch barrel length reduces velocity compared to full-size variants. The 7.4″ x 5.2″ dimensions exceed some compact alternatives.
| Specification | FN 509 Midsize MRD | Potential Issue |
|---|---|---|
| Trigger Pull | 5.5-7.7 lbs | Heavy for precision |
| Weight | 26.5 oz | Carry fatigue |
| Barrel Length | 4 inches | Reduced velocity |
| Dimensions | 7.4″ x 5.2″ | Larger footprint |
Reliability
How consistently does the FN 509 Midsize MRD perform under demanding conditions? You’ll find exceptional reliability through rigorous testing and extensive law enforcement field validation.
The robust design provides better recoil management while maintaining flawless function with various ammunition types. Optics-ready configuration doesn’t compromise reliability, and high-capacity FN 509 magazines feed consistently under harsh operational stress conditions.
Similar Models
The FN 509 series encompasses several variants that share core design elements with the Midsize MRD while targeting different carry preferences and shooting applications.
You’ll find the Compact, Tactical, and full-size models feature similar improved texturing and Low Profile Optics Mounting systems. These variants remain compatible with larger capacity magazines, while enhanced controls aid in manipulation across the entire platform lineup.
Similar Models From Other Manufacturers
Beyond FN’s own lineup, several manufacturers produce striker-fired, polymer-frame pistols that compete directly with the 509 Midsize MRD’s feature set and intended role.
The Sig Sauer P320’s modular frame system offers improved versatility. Glock 19 provides better proven reliability. Smith & Wesson M&P9 M2.0 features enhanced ergonomics. Springfield XD-M Elite delivers superior capacity options.
Maintenance
While proper maintenance ensures optimal performance and longevity of your FN 509 Midsize MRD, you’ll need to establish regular cleaning intervals based on usage patterns and environmental conditions.
Field strip following manual procedures, use manufacturer-recommended cleaning solvents exclusively. The new improved texturing and included backstraps provides better grip during maintenance operations.
Inspect components systematically, replacing worn parts immediately.
History
Born from military competition requirements, FN Herstal developed the 509 Midsize MRD as their submission for the U.S. Army’s Modular Handgun System competition in 2015. Though SIG Sauer won, FN released this commercial variant in 2017.
The midsized frame incorporates FN Low Profile Optics mounting capabilities, two included backstraps for customization, and striker-fired operation for tactical use.
Frequently Asked Questions
How Much Is a FN 509 Midsize MRD?
You’ll find the FN 509 Midsize MRD priced at $834.00 MSRP. This pistol offers a 15-round magazine capacity with crisp trigger pull weight characteristics. Its ergonomic design enhances grip comfort and control.
The standout feature is its optics-ready platform, accommodating over 10 miniature red dot sights through FN’s Low Profile Optics Mounting System. You can purchase it through various retailers, with potential financing options and periodic discounts available.
What Does Mrd Mean on FN 509?
Like a crown atop a king, MRD stands for “Miniature Red Dot” – your low-profile optics mounting system. You’ll find it integrates seamlessly with your 4-inch barrel length specifications while maintaining the 15-round magazine capacity options.
The ergonomic design features remain unchanged, preserving your familiar grip geometry and trigger pull quality. You’re getting compatibility with 10+ red dot optics that co-witness perfectly with iron sights through FN’s precision-engineered mounting platform.
Is a FN Better Than a Glock?
You’ll find FN pistols generally offer superior trigger pull quality and ergonomics design compared to Glock’s utilitarian approach. FN’s trigger breaks cleaner with less overtravel, while their grip geometry accommodates varied hand sizes better.
However, Glock’s magazine capacity often matches or exceeds FN’s offerings. Regarding sights alignment, FN typically provides better factory iron sights with clearer sight pictures. Your choice depends on prioritizing refined shooting characteristics versus Glock’s proven simplicity and extensive aftermarket ecosystem.
Why Are FN Guns so Expensive?
FN’s manufacturing costs exceed industry averages by 40-60% due to their rigorous quality control protocols. You’re paying for precision-machined components, advanced ergonomic design features, and proprietary innovation features like their cold hammer-forged barrels.
Their brand reputation commands premium pricing because they maintain NATO military contracts requiring exceptional reliability standards. You’ll find FN uses specialized metallurgy, tighter tolerances, and extensive testing procedures that budget manufacturers can’t match, justifying their higher price point.
Conclusion
You’ll find the FN 509 Midsize MRD delivers dependable duty-grade performance with its proven polymer platform. This pistol’s precision-machined parts and meticulous manufacturing ensure consistent cycling and reliable results. You can’t compromise on carry comfort—the midsize frame fits most hand sizes while maintaining full-size firepower. The MRD’s mounting system accommodates various optics configurations, making it versatile for tactical applications. You’re getting battle-tested Belgian engineering that’s proven in professional and personal defense scenarios.
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