Gun Pro Delta 1 Sight Set for FN 509 – D1SFN-1
Manufacturer: Gun Pro LLC • Model: GUN PRO DELTA 1 SIGHT SET FN509 • Part #: D1SFN-1 • UPC: 854459008014 Buds Gun Shop+1
Upgrade your FN 509 with the Gun Pro Delta 1 Sight Set FN509 (D1SFN-1) – a low-profile, high-visibility iron sight system engineered to deliver lightning-fast, single-point sight alignment and a wide, open sight picture. Designed specifically to fit the FN 509 platform, this sight set replaces the factory irons with Gun Pro’s patented Delta 1 Sights® geometry, giving you quicker target acquisition and more intuitive shot placement for defensive carry, duty use, and range training. TheGunZone+3Brownells+3Gun Pro+3
Key Features – Gun Pro GUN PRO DELTA 1 SIGHT SET FN509 D1SFN-1
Exact Fit for: FN 509 pistols (Make/Model Fit listed as FN 509 on major dealer spec sheets) Brownells+2Brownells+2
Part Number: D1SFN-1 • Stock #: 250022167 • UPC: 854459008014 Buds Gun Shop+2Buds Gun Shop+2
Delta 1 Sights® Design: Open sight picture with single-point alignment for faster, simpler sight pictures LG Outdoors Website+3Gun Pro+3Delta 1 Sights®+3
Low-Profile, Snag-Resistant: Streamlined silhouette that complements the FN 509 and reduces snagging on holsters or clothing Gun Values Board+1
High-Visibility Aiming Index: Delta 1 geometry gives a distinct, easy-to-see aiming reference for daylight and low-light visibility Delta 1 Sights®+2Gun Pro+2
Durable Construction: Robust metal sights built to withstand regular carry and range use, with a protective finish to resist wear and corrosion TheGunZone+2Gun Values Board+2
Easy Installation: Designed to install on FN 509 dovetails with standard sight tools—no major gunsmithing required according to user reviews and product write-ups TheGunZone+2TheGunZone+2
Innovative Delta 1 Single-Point Sight Picture
The core advantage of the Delta 1 Sight Set is its single-point, open sight alignment. Instead of aligning three separate dots or trying to center a front post in a tight rear notch, Delta 1 Sights® give you: LG Outdoors Website+3Gun Pro+3Delta 1 Sights®+3
A panoramic rear sight window that stays out of your way and preserves peripheral vision
A distinct delta-shaped alignment reference and matching front index that create one clear aiming point
A sight picture that requires less visual and mental estimation, speeding up your ability to confirm alignment
Independent reviews of Delta 1 Sights remark that this design helps shooters get a fast, precise sight alignment that’s easy to read under stress, whether you’re working from concealment, transitioning between targets, or shooting on the move. TheGunZone+3Gun Pro+3The Truth About Guns+3
Faster Target Acquisition on Your FN 509
The Gun Pro GUN PRO DELTA 1 SIGHT SET FN509 is purpose-built to help FN 509 shooters acquire the front sight faster and stay on target more easily. Reviewers consistently highlight: TheGunZone+2TheGunZone+2
Quicker target acquisition thanks to the open rear and bold aiming index
A sight picture that is easy to pick up from the draw, reducing the time from presentation to accurate shot
Improved ability to track the front sight during rapid strings of fire
Gun Pro’s own materials emphasize that Delta 1 Sights are engineered so the shooter can quickly drop the intended point of impact into the “sweet spot” of the sight picture with minimal guesswork, making them well-suited for defensive drills, IPSC/IDPA-style competition, and high-tempo training. The Truth About Guns+3Delta 1 Sights®+3Rainier Arms+3
Low-Profile, Carry-Friendly Design
For a pistol that may serve double duty as a defensive or concealed-carry handgun, sight geometry matters. The Delta 1 Sight Set FN509 is described as a low-profile, streamlined system that: Gun Values Board+2TheGunZone+2
Sits close to the slide to reduce snagging on holsters, belts, or cover garments
Maintains the FN 509’s clean, professional look with a dark, glare-reducing finish
Adds minimal bulk or weight to the top of the slide
That means you gain a more intuitive sight picture without compromising daily carry comfort or reliability through unwanted catches on gear.
Rugged Construction & Protective Finish
While some budget sights trade durability for price, reviews of the Gun Pro Delta 1 Sight Set FN509 note its robust construction and long-term reliability. TheGunZone+2Gun Values Board+2
Key durability advantages include:
Machined metal sight bodies built to handle repeated recoil and holster work
A protective black finish that helps minimize glare and resists scratching and corrosion
A design intended to hold zero through normal range use and carry, assuming proper installation
With routine cleaning of your slide and sights, this set is intended to deliver years of dependable service on your FN 509.
High-Visibility Sight Picture in Varying Light
Delta 1 Sights are promoted as offering daylight, low light, and dark visibility, aided by their high-contrast geometry and rear sight technology across the product line. Delta 1 Sights®+2Delta 1 Sights®+2
While specific color treatments vary across different pistol models, the platform-wide design principles focus on:
A bold front sight reference that naturally draws your eye during the draw stroke
A delta-style rear reference that remains visible under less-than-ideal lighting
An open sight picture that avoids “tunneling,” preserving awareness of your target and surroundings
For lawfully configured home defense or duty pistols where you may need to confirm sights quickly in mixed lighting, this enhanced visibility is a major benefit.
Simple, User-Friendly Installation
Product write-ups and owner reviews describe the Gun Pro Delta 1 Sight Set FN509 as straightforward to install on the FN 509 slide using standard handgun sight tools—no major custom fitting or permanent modifications required when done correctly. TheGunZone+2TheGunZone+2
Typical installation steps (follow the manufacturer’s instructions for your tools and always ensure the pistol is unloaded):
Safely remove the FN 509’s factory front and rear sights using a sight pusher or non-marring drift and hammer
Press the Gun Pro Delta 1 sights into the dovetails, centering them on the slide
Confirm alignment and fine-tune zero at the range, adjusting your point of impact by slightly shifting the sights if needed
If you are not comfortable installing pistol sights, a qualified gunsmith can usually complete the job quickly with the proper equipment.
Ideal Uses – Defense, Duty, and Performance Training
Thanks to its combination of speed, simplicity, and durability, the Gun Pro GUN PRO DELTA 1 SIGHT SET FN509 D1SFN-1 shines in a variety of lawful roles: The Truth About Guns+3TheGunZone+3Frisco Guns+3
Concealed carry / EDC: Low-profile, snag-resistant design with a sight picture that comes together quickly under stress
Home defense training: Single-point sight alignment helps you confirm shots rapidly in realistic, low-light drills
Competition and range work: Faster target transitions and easier tracking for defensive handgun matches or skills practice
Regardless of role, the key is that Delta 1’s single-point alignment and open rear picture make the FN 509 feel more intuitive to run once you’ve acclimated to the new sight picture.
Technical Specifications – Gun Pro Delta 1 Sight Set FN509
Based on manufacturer and dealer listings: TheGunZone+3Buds Gun Shop+3Brownells+3
Product Name: Gun Pro Delta 1 Sight Set FN509
Manufacturer: Gun Pro LLC
Manufacturer Part Number: D1SFN-1
Stock / SKU Numbers (Common): 250022167 / store-specific SKUs
UPC: 854459008014
Platform Fit: FN 509 pistols
Sight Type: Fixed Delta 1 Sights® – open sight picture, single-point alignment
Profile: Low-profile, snag-resistant handgun sights
Construction: Metal sights with protective finish (black)
Intended Use: Defensive carry, duty, training, and competition (where iron sights are permitted)
(Exact material alloys or minor cosmetic details may vary slightly by production batch; always consult the latest information from Gun Pro or your retailer.)
Why Choose the Gun Pro GUN PRO DELTA 1 SIGHT SET FN509?
If you own an FN 509 and want a sight upgrade that actually changes how quickly and confidently you can align your pistol, the Gun Pro Delta 1 Sight Set FN509 D1SFN-1 delivers:
For many FN 509 owners, this sight set is an affordable, high-impact upgrade that brings the pistol’s iron sight system in line with modern performance expectations while still keeping things simple and robust.
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