{"id":1490,"date":"2026-01-24T12:47:40","date_gmt":"2026-01-24T12:47:40","guid":{"rendered":"https:\/\/polymer80firearms.com\/?post_type=product&#038;p=1490"},"modified":"2026-01-24T12:48:10","modified_gmt":"2026-01-24T12:48:10","slug":"kak-complete-ar15-upper-receiver-9mm-16%e2%80%b3-barrel-13%e2%80%b3-mlok","status":"publish","type":"product","link":"https:\/\/usaguncenter.com\/polymer80\/product\/kak-complete-ar15-upper-receiver-9mm-16%e2%80%b3-barrel-13%e2%80%b3-mlok\/","title":{"rendered":"KAK Complete AR15 Upper Receiver \u2013 9mm \u2013 16\u2033 Barrel \u2013 13\u2033 MLOK"},"content":{"rendered":"<div class=\"wc-tab-inner wd-entry-content\">\n<p>Upgrade your next AR9 build with this complete upper assembly from\u00a0<strong>KAK Industry<\/strong>, engineered to pair perfectly with 80% AR9 lowers. Chambered in 9mm, this upper features a durable\u00a0<strong>16\u2033 barrel<\/strong>\u00a0and a sleek\u00a0<strong>13\u2033 M-LOK free-float handguard<\/strong>, offering excellent modularity and balance for pistol-caliber carbine setups.<\/p>\n<p>This upper ships\u00a0<strong>fully assembled<\/strong>\u00a0and includes a\u00a0<strong>bolt carrier group<\/strong>,\u00a0<strong>charging handle<\/strong>,\u00a0<strong>forward assist<\/strong>, and\u00a0<strong>dust cover<\/strong>\u2014ready to mount and go, straight out of the box.<\/p>\n<p>Perfect for building your AR9 pistol or carbine, this upper offers reliability, performance, and clean fitment\u2014all backed by KAK Industry\u2019s commitment to quality. No guesswork. No hassle. Just performance you can count on.<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 Upper<\/p>\n<ul>\n<li>Barrel Length- 16\u201d<\/li>\n<li>Barrel Material- 41V50 Button Rifled Barrel<\/li>\n<li>Chamber 9MM NATO<\/li>\n<li>Twist Rate 1:10<\/li>\n<li>Muzzle Device Milspec A2 birdcage 1\/2-36<\/li>\n<li>Gas System- Blowback\u00a0<\/li>\n<li>Upper Receiver- Forged 7075 T6 Aluminum, Precision Machined to M16\/M4 Spec<\/li>\n<li>Handguard- 13\u201d, High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel Nut<\/li>\n<li>Charging Handle- Milspec with Enhanced Large Billet Latch<\/li>\n<\/ul>\n<p>BCG<\/p>\n<ul>\n<li>One piece BCG<\/li>\n<li>Auto Profile Carrier Machined from Aircraft\/ Bearing Quality 8620 Steel, Properly Heat Treated, Ground to Perfection, Black Nitride Finish by H&amp;M<\/li>\n<li>Firing pin is machined from 8740, precision ground, and chrome plated<\/li>\n<li>One Piece Billet Fully Machined Enhanced Extractor, Phosphate coated for Increased reliability and corrosion resistance<\/li>\n<li>S7 tool steel ejector and extractor retaining pin<\/li>\n<li>4130 Gas Key, nitride, precision staked using our hydraulic staking machine<\/li>\n<li>Carrier key screws- Grade 8, properly heat-treated and staked<\/li>\n<li>Weighted 1 Piece BCG, works with all types of hammers, compatible with Colt and Glock Style Magazines<\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<p>All KAK complete upper receivers are test fired for feed and function using commercially loaded ammunition<\/p>\n<p>Please note: KAK Industry 9mm uppers do <strong>not<\/strong> support last round bolt hold open (LRBHO) functionality when used with our AR9 lowers.<\/p>\n<h3>Shipping Restrictions:\u00a0<\/h3>\n<p>This item is restricted from shipping to the following:\u00a0Colorado, Connecticut, Hawaii, Illinois, Maryland, Nevada, New Jersey, New York, Philadelphia, York City, and Reading Pennsylvania, Rhode Island, Washington, and Washington D.C.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Upgrade your next AR9 build with this complete upper assembly from\u00a0KAK Industry, engineered to pair perfectly with 80% AR9 lowers. Chambered in 9mm, this upper features a durable\u00a016\u2033 barrel\u00a0and a sleek\u00a013\u2033 M-LOK free-float handguard, offering excellent modularity and balance for pistol-caliber carbine setups. This upper ships\u00a0fully assembled\u00a0and includes a\u00a0bolt carrier group,\u00a0charging handle,\u00a0forward assist, and\u00a0dust cover\u2014ready [&hellip;]<\/p>\n","protected":false},"featured_media":1542,"comment_status":"open","ping_status":"closed","template":"","meta":{"_gspb_post_css":"","iawp_total_views":0},"product_brand":[23],"product_cat":[50],"product_tag":[],"class_list":{"0":"post-1490","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-polymer80","7":"product_cat-complete-upper-receivers","9":"first","10":"instock","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>KAK Complete AR15 Upper Receiver \u2013 9mm \u2013 16\u2033 Barrel \u2013 13\u2033 MLOK - Polymer 80 Firearms - Authorized Polymer80 Distributor<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/usaguncenter.com\/polymer80\/product\/kak-complete-ar15-upper-receiver-9mm-16\u2033-barrel-13\u2033-mlok\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"KAK Complete AR15 Upper Receiver \u2013 9mm \u2013 16\u2033 Barrel \u2013 13\u2033 MLOK\" \/>\n<meta property=\"og:description\" content=\"Upgrade your next AR9 build with this complete upper assembly from\u00a0KAK Industry, engineered to pair perfectly with 80% AR9 lowers. 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