{"id":6635,"date":"2026-07-26T22:48:51","date_gmt":"2026-07-26T22:48:51","guid":{"rendered":"https:\/\/landmarkfirearms.com\/ca\/?post_type=product&#038;p=6635"},"modified":"2026-07-26T22:49:07","modified_gmt":"2026-07-26T22:49:07","slug":"fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver","status":"publish","type":"product","link":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/","title":{"rendered":"FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver"},"content":{"rendered":"<h2 id=\"main-product-title\" class=\"item_header\">Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online<\/h2>\n<div>\n<p>Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online. Multi-Caliber, Mil-Spec, AR15 Lower Receiver, manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer allows for superior strength, unmatched durability and is extremely lightweight only 4.3oz. The AR1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any good project is the foundation and on an AR15, that is the lower receiver. The Ar1 eXtreme comes with a lifetime warranty; and of course, it\u2019s Proudly American. Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online.<\/p>\n<p><u>Specifications:<\/u><\/p>\n<ul>\n<li>Superior strength \u2013 Built with proprietary composite polymer to withstand extreme conditions.<\/li>\n<li>Unmatched durability \u2013 When most lowers dent or break the AR1 eXtreme bounces back to shape.<\/li>\n<li>Extremely lightweight \u2013 4.3oz \u2022 Accepts all standard MIL SPEC uppers up to .50 Beowulf<\/li>\n<li>Compatible with most current AR15 lower parts kits, grips and stocks.<\/li>\n<\/ul>\n<\/div>\n<div>\n<table id=\"gorkAcubeZTpBrWA\" class=\"table table-striped table-bordered\" role=\"presentation\">\n<tbody>\n<tr>\n<td colspan=\"2\"><strong>Product Information<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Metal Finish<\/td>\n<td>Black<\/td>\n<\/tr>\n<tr>\n<td>Caliber<\/td>\n<td><a href=\"https:\/\/westerngunshop.com\/about\/\" aria-label=\"View this caliber in search\">Multiple<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<div>Model: <strong>FMKGAR1E<\/strong><\/div>\n<div><\/div>\n<div>Condition: <strong>Factory New<\/strong><\/div>\n<div><\/div>\n<div>UPC: <strong>850979004338<\/strong><\/div>\n<div><\/div>\n<div>MFG: <strong>FMK Firearms<\/strong><\/div>\n","protected":false},"featured_media":6666,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[164,197,256],"product_tag":[],"class_list":["post-6635","product","type-product","status-publish","product_cat-firearms","product_cat-long-guns-for-sale","product_cat-lower-receivers-for-sale","first","instock","sale","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online | Canada<\/title>\n<meta name=\"description\" content=\"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online. Multi-Caliber, Mil-Spec, AR15 Lower Receiver, manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer allows for superior strength, unmatched durability and is extremely lightweight only 4.3oz. The AR1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any good project is the foundation and on an AR15, that is the lower receiver. The Ar1 eXtreme comes with a lifetime warranty; and of course, it\u2019s Proudly American. Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online | Canada\" \/>\n<meta property=\"og:description\" content=\"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online. Multi-Caliber, Mil-Spec, AR15 Lower Receiver, manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer allows for superior strength, unmatched durability and is extremely lightweight only 4.3oz. The AR1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any good project is the foundation and on an AR15, that is the lower receiver. The Ar1 eXtreme comes with a lifetime warranty; and of course, it\u2019s Proudly American. Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/\" \/>\n<meta property=\"og:site_name\" content=\"Canada\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-26T22:49:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-FMK-Firearms-Firearms-AR1EXTREME-AR-15-Mil-Spec-Stripped-Lower-Receiver-Online.png\" \/>\n\t<meta property=\"og:image:width\" content=\"796\" \/>\n\t<meta property=\"og:image:height\" content=\"365\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\\\/\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\\\/\",\"name\":\"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online | Canada\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/Buy-FMK-Firearms-Firearms-AR1EXTREME-AR-15-Mil-Spec-Stripped-Lower-Receiver-Online.png\",\"datePublished\":\"2026-07-26T22:48:51+00:00\",\"dateModified\":\"2026-07-26T22:49:07+00:00\",\"description\":\"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online. Multi-Caliber, Mil-Spec, AR15 Lower Receiver, manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer allows for superior strength, unmatched durability and is extremely lightweight only 4.3oz. The AR1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any good project is the foundation and on an AR15, that is the lower receiver. The Ar1 eXtreme comes with a lifetime warranty; and of course, it\u2019s Proudly American. Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\\\/#primaryimage\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/Buy-FMK-Firearms-Firearms-AR1EXTREME-AR-15-Mil-Spec-Stripped-Lower-Receiver-Online.png\",\"contentUrl\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/Buy-FMK-Firearms-Firearms-AR1EXTREME-AR-15-Mil-Spec-Stripped-Lower-Receiver-Online.png\",\"width\":796,\"height\":365},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/shop\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#website\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/\",\"name\":\"Canada\",\"description\":\"Premium Guns, Ammo &amp; Tactical Gear\",\"publisher\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#organization\",\"name\":\"Canada\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/logo-land.png\",\"contentUrl\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/logo-land.png\",\"width\":927,\"height\":221,\"caption\":\"Canada\"},\"image\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online | Canada","description":"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online. Multi-Caliber, Mil-Spec, AR15 Lower Receiver, manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer allows for superior strength, unmatched durability and is extremely lightweight only 4.3oz. The AR1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any good project is the foundation and on an AR15, that is the lower receiver. The Ar1 eXtreme comes with a lifetime warranty; and of course, it\u2019s Proudly American. Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/","og_locale":"en_US","og_type":"article","og_title":"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online | Canada","og_description":"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online. Multi-Caliber, Mil-Spec, AR15 Lower Receiver, manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer allows for superior strength, unmatched durability and is extremely lightweight only 4.3oz. The AR1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any good project is the foundation and on an AR15, that is the lower receiver. The Ar1 eXtreme comes with a lifetime warranty; and of course, it\u2019s Proudly American. Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online.","og_url":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/","og_site_name":"Canada","article_modified_time":"2026-07-26T22:49:07+00:00","og_image":[{"width":796,"height":365,"url":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-FMK-Firearms-Firearms-AR1EXTREME-AR-15-Mil-Spec-Stripped-Lower-Receiver-Online.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/","url":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/","name":"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online | Canada","isPartOf":{"@id":"https:\/\/landmarkfirearms.com\/ca\/#website"},"primaryImageOfPage":{"@id":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/#primaryimage"},"image":{"@id":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/#primaryimage"},"thumbnailUrl":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-FMK-Firearms-Firearms-AR1EXTREME-AR-15-Mil-Spec-Stripped-Lower-Receiver-Online.png","datePublished":"2026-07-26T22:48:51+00:00","dateModified":"2026-07-26T22:49:07+00:00","description":"Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online. Multi-Caliber, Mil-Spec, AR15 Lower Receiver, manufactured in the USA of a high impact proprietary composite polymer. This state of the art polymer allows for superior strength, unmatched durability and is extremely lightweight only 4.3oz. The AR1 eXtreme is by far the strongest composite polymer lower on the market today. The key to any good project is the foundation and on an AR15, that is the lower receiver. The Ar1 eXtreme comes with a lifetime warranty; and of course, it\u2019s Proudly American. Buy FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver Online.","breadcrumb":{"@id":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/#primaryimage","url":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-FMK-Firearms-Firearms-AR1EXTREME-AR-15-Mil-Spec-Stripped-Lower-Receiver-Online.png","contentUrl":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-FMK-Firearms-Firearms-AR1EXTREME-AR-15-Mil-Spec-Stripped-Lower-Receiver-Online.png","width":796,"height":365},{"@type":"BreadcrumbList","@id":"https:\/\/landmarkfirearms.com\/ca\/product\/fmk-firearms-firearms-ar1extreme-ar-15-mil-spec-stripped-lower-receiver\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/landmarkfirearms.com\/ca\/"},{"@type":"ListItem","position":2,"name":"Shop","item":"https:\/\/landmarkfirearms.com\/ca\/shop\/"},{"@type":"ListItem","position":3,"name":"FMK Firearms Firearms AR1EXTREME AR-15 Mil-Spec Stripped Lower Receiver"}]},{"@type":"WebSite","@id":"https:\/\/landmarkfirearms.com\/ca\/#website","url":"https:\/\/landmarkfirearms.com\/ca\/","name":"Canada","description":"Premium Guns, Ammo &amp; Tactical Gear","publisher":{"@id":"https:\/\/landmarkfirearms.com\/ca\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/landmarkfirearms.com\/ca\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/landmarkfirearms.com\/ca\/#organization","name":"Canada","url":"https:\/\/landmarkfirearms.com\/ca\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/landmarkfirearms.com\/ca\/#\/schema\/logo\/image\/","url":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/logo-land.png","contentUrl":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/logo-land.png","width":927,"height":221,"caption":"Canada"},"image":{"@id":"https:\/\/landmarkfirearms.com\/ca\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product\/6635","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/comments?post=6635"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/media\/6666"}],"wp:attachment":[{"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/media?parent=6635"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product_brand?post=6635"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product_cat?post=6635"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product_tag?post=6635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}