--- title: "FN America 509 MRD 9mm Optics-Ready Pistol" description: "FN 509 MRD 9mm pistol with a 3.8\" alloy steel barrel, internal hammer-fired SAO action, thumb safety, and direct-mount optics system." canonical_url: "https://www.kygunco.com/product/fn-america-fn309-9mm-3.8-blk-20rd-ms" meta: author: KYGUNCO "og:description": "FN 509 MRD 9mm pistol with a 3.8\" alloy steel barrel, internal hammer-fired SAO action, thumb safety, and direct-mount optics system." "og:image": "https://cdn.kygunco.com/assets/products/304464/thumbnail.jpg?v=1777919020" "og:image:height": "500" "og:image:width": "500" "og:title": "FN America 509 MRD 9mm Optics-Ready Pistol" --- > Index of every page on this site: [llms.txt](https://www.kygunco.com/llms.txt) [Home](https://www.kygunco.com/) / [Shooting](https://www.kygunco.com/category/shooting) / [Guns](https://www.kygunco.com/category/shooting/guns) / [Handguns](https://www.kygunco.com/category/shooting/guns/handguns) / [Semi-Auto](https://www.kygunco.com/category/shooting/guns/handguns/semi-auto) / FNM-66-102378 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/304464/main.jpg?v=1777919020) For illustration purposes only, this image may not be an exact representation of the product. # FN AMERICA FN309 9mm 3.8" 17rd/20rd MS - Black The FN 509 MRD is a compact 9mm pistol with an internal hammer-fired SAO action, polymer frame, thumb safety, and FN Optics Mounting System for direct red-dot installation. It features a 3.8-inch alloy steel barrel, reversible magazine release, recessed target crown, and green fiber-optic front sight with a high-visibility U-notch rear. See Price In Cart ** 5 interest-free payments of **$87.60** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** ![Credova logo](https://www.kygunco.com/brands/credova.svg) Pay over time with ![Credova text logo](https://www.kygunco.com/brands/credova-text.svg) ** Online In Store ** Free Shipping Enjoy delivery to the Lower 48 States at no cost. ** Ships To FFL Dealer Handled by our expert shippers in Bardstown, KY. ** Check Local Restrictions Not sure whether this item can be shipped to your area? Enter your ZIP code for a quick check. Almost gone. Order now before it sells out. Item # 304464 Style FNM-66-102378 UPC 845737020620 Condition New Manufacturer [FN America](https://www.kygunco.com/brand/fn-america) Model FN 309 MRD Caliber 9mm Action Semi-Auto The FN 509™ MRD is engineered for dependable, everyday personal defense with a focus on ease of use and consistent performance. Designed around an internal hammer-fired system, it delivers a crisp trigger feel while reducing slide racking effort for smoother operation. With balanced dimensions and a modern optics-ready design, the 509 MRD prioritizes control, reliability, and confidence in a compact defensive platform. FEATURES - Internal hammer-fired operating system for a smooth, consistent trigger pull - FN Optics Mounting System supports direct mounting of red-dot optics - Reduced slide racking force for easier manipulation - Recessed target crown to help protect the barrel and maintain accuracy - Reversible magazine release for improved adaptability - Green fiber-optic front sight paired with a high-visibility U-notch rear SPECIFICATIONS - Caliber: 9mm Luger - Action: Single Action Only (SAO) - Capacity: 16-round and 20-round magazines - Barrel Length: 3.8 in - Barrel Material: Alloy steel - Twist Rate: 1:10 RH - Frame Material: Polymer - Safety: Thumb safety - Sight Radius: 6.3 in - Overall Length: 7.4 in - Height: 5.4 in - Width: 1.26 in - Weight: 22.5 oz ** WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to [www.p65warnings.ca.gov](https://www.p65warnings.ca.gov). 0.0 ** ** ** ** ** 0 reviews ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## Don't Forget Your Ammo ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.kygunco.com/#website","@type":"WebSite","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"KYGUNCO","url":"https://www.kygunco.com/","publisher":{"@id":"https://www.kygunco.com/#/schema/organization/kygunco"}},{"@id":"https://www.kygunco.com/product/fn-america-fn309-9mm-3.8-blk-20rd-ms#webpage","@type":"WebPage","description":"FN 509 MRD 9mm pistol with a 3.8\" alloy steel barrel, internal hammer-fired SAO action, thumb safety, and direct-mount optics system.","name":"FN America 509 MRD 9mm Optics-Ready 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