--- title: "FN America FN 509 Midsize MRD 9mm Pistol" description: "Black 9mm pistol with a 4\" barrel, low-profile optics mounting system, co-witness sights, ambidextrous controls, and two 10rd magazines." canonical_url: "https://www.kygunco.com/product/fnh-usa-66-100588-fn509-midsize-mrd-9mm-4-black-101" meta: author: KYGUNCO "og:description": "Black 9mm pistol with a 4\" barrel, low-profile optics mounting system, co-witness sights, ambidextrous controls, and two 10rd magazines." "og:image": "https://cdn.kygunco.com/assets/products/145274/thumbnail.jpg?v=1713454127" "og:image:height": "500" "og:image:width": "500" "og:title": "FN America FN 509 Midsize MRD 9mm 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-66-100588 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/145274/main.jpg?v=1713454127) For illustration purposes only, this image may not be an exact representation of the product. # FN AMERICA FN509 Midsize MRD 9mm 4" 10rd Optic Ready Pistol w/ Co Witness Sights - Black The FN 509 Midsize MRD is a black 9mm pistol with a 4" barrel, low-profile optics mounting system, and co-witness iron sights. It features a polymer frame, fully ambidextrous controls, textured interchangeable backstraps, a flatter-faced trigger, and 10rd standard capacity. Includes two backstraps, two 10rd magazines, and a locking device. See Price In Cart ** 5 interest-free payments of **$135.37** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** ![Credova logo](https://www.kygunco.com/brands/credova.svg) As low as **$120.84**/month 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 Fulfilled by a partner warehouse. ** Partner Fulfilled ** 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 # 145274 Style FNM-66-100588 UPC 845737010744 Condition New Manufacturer [FN America](https://www.kygunco.com/brand/fn-america) Model FN 509 Hand Right Hand Finish Black Round Capacity 10 Caliber 9mm Action Double Action Only Barrel Length 4 in The FN 509M MRD brings you the FN Low Profile Optics Mounting System, giving you the option of direct mounting more than 10 different miniature red dot optics to your concealed carry pistol. Featuring a midsized frame, fully ambidextrous controls, all-black co-witness iron sights, standard 10rd capacity and is compatible with larger capacity FN 509 magazines with use of a sleeve. The improved controls aid in manipulation, the new improved texturing on the two included backstraps provides better recoil management and a new flatter faced trigger allows for more controllable trigger press and cleaner break. Includes- two interchangeable backstraps, two 10rd magazines and a locking device. - Action: DAO - Caliber: 9mm Luger - Barrel Length: 4" - Capacity: 10+1 - Safety: No Manual - Grips: Textured Black Interchangeable Backstraps - Sight Configuration: Co-Witness Iron - Weight: 26.5 oz - Frame Finish: Matte Black - Frame Material: Polymer - Slide Description: Black Steel - Sight Style: Combat - Barrel Length Range: 4.00" to 4.99" ** 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). ## Frequently Bought Together 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/fnh-usa-66-100588-fn509-midsize-mrd-9mm-4-black-101#webpage","@type":"WebPage","description":"Black 9mm pistol with a 4\" barrel, low-profile optics mounting system, co-witness sights, ambidextrous controls, and two 10rd magazines.","name":"FN America FN 509 Midsize MRD 9mm 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