--- title: "FMK Firearms AR-15 Polymer Lower, Black Finish" description: "Black multi-caliber AR-15 lower receiver made from high-impact composite polymer. Weighs 4.3 oz and accepts mil-spec uppers up to .50 Beowulf." canonical_url: "https://www.kygunco.com/product/fmk-firearms-ar-15-lower-black-finish-polymer" meta: author: KYGUNCO "og:description": "Black multi-caliber AR-15 lower receiver made from high-impact composite polymer. Weighs 4.3 oz and accepts mil-spec uppers up to .50 Beowulf." "og:image": "https://cdn.kygunco.com/assets/products/269429/thumbnail.jpg?v=1731510985" "og:image:height": "500" "og:image:width": "500" "og:title": "FMK Firearms AR-15 Polymer Lower, Black Finish" --- > 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) / [Gun Parts](https://www.kygunco.com/category/shooting/gun-parts) / [Handgun & Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts) / [Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts) / [Receivers & Lowers](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts/receivers-and-lowers) / FMK-GAR1E ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/269429/main.jpg?v=1731510985) For illustration purposes only, this image may not be an exact representation of the product. # FMK FIREARMS AR-15 Lower Black Finish Polymer The FMK Firearms AR1 lower receiver is a multi-caliber AR-15 lower made from high-impact proprietary composite polymer. Weighing 4.3 oz, it is compatible with most current AR-15 lower parts kits, grips, and stocks, and accepts mil-spec upper receivers up to .50 Beowulf. $35.08 ** 4 interest-free payments of **$8.77** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.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. Item # 269429 Style FMK-GAR1E UPC 850979004338 Condition New Manufacturer [FMK Firearms](https://www.kygunco.com/brand/fmk-firearms) Model LOWER Caliber MULTI Weight 2 lb Action Semi-Auto The FMK Firearms AR1 lower receiver is a multi-caliber, AR15 Lower Receiver, manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer provides superior strength, unmatched durability and is extremely lightweight at only 4.3oz compared to competing polymer lowers. The AR1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any AR build is the foundation and on an AR15, that is the lower receiver. This lower is compatible with most current AR15 lower parts kits, grips and stocks, and accepts mil-spec upper receivers up to .50 Beowulf. ** 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 ## More from FMK Firearms ```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/fmk-firearms-ar-15-lower-black-finish-polymer#webpage","@type":"WebPage","description":"Black multi-caliber AR-15 lower receiver made from high-impact composite polymer. 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