{"id":1308,"date":"2026-01-24T12:46:07","date_gmt":"2026-01-24T12:46:07","guid":{"rendered":"https:\/\/polymer80firearms.com\/?post_type=product&#038;p=1308"},"modified":"2026-01-24T12:46:24","modified_gmt":"2026-01-24T12:46:24","slug":"complete-10-5%e2%80%b3-5-56-300blk-ar-15-pistol-80-build-kit","status":"publish","type":"product","link":"https:\/\/usaguncenter.com\/polymer80\/product\/complete-10-5%e2%80%b3-5-56-300blk-ar-15-pistol-80-build-kit\/","title":{"rendered":"Complete 10.5\u2033 5.56\/300BLK AR-15 Pistol 80% Build Kit"},"content":{"rendered":"<div class=\"wc-tab-inner wd-entry-content\">\n<p>This 80-percent build kit contains all the necessary high-quality parts to build your AR-15 Pistol at home! We removed all of the guesswork and packaged the necessary parts to build your AR-15 Pistol in one, easy to purchase, complete kit. Buy as a complete AR-15 Pistol upper kit and save money versus purchasing the necessary items separately! This 10.5\u2033 AR Pistol build kit comes standard with our great looking 10\u2033 M-LOK handguard which will offer a variety of attachment options in a perfect blend of form and function.<\/p>\n<p>This Kit Contains:<\/p>\n<ul>\n<li>10.5\u2033 AR-15 Pistol Upper Receiver<\/li>\n<li>Black Nitride .223\/5.56\/300 BLK Bolt Carrier Group<\/li>\n<li>Standard Charging Handle<\/li>\n<li>Pistol Buffer Tube Kit with Foam Pad Cover<\/li>\n<li>Billet Aluminum 6061 AR-15 80% Lower Receiver<\/li>\n<li>Mil-Spec AR-15 Lower Parts Kit<\/li>\n<\/ul>\n<p><strong>About the options:<br \/><\/strong><\/p>\n<p>\u00a0<\/p>\n<p><strong>Caliber<\/strong><br \/>Choosing between the two most popular calibers for an AR15 isn\u2019t always an easy choice. However, it really comes down to what you want to do with it. Out of such a short barrel, the .300BLK will carry more energy, though the 5.56 will move quicker, shoot flatter, and cost you less. For a more in depth look, take a look at our blog post on the most popular AR 15 calibers.\u00a0<\/p>\n<div>\u00a0<\/div>\n<div><strong>Muzzle Device<\/strong><br \/>A2 Style Flash Hider or Compact Muzzle Brake? While mostly a matter of looks or preference, some states have outlawed A2 Style Flash Hiders or consider them to be \u201cevil features\u201d, contributing toward what may or may not be considered an \u201cassault rifle\u201d under the definition of state law. Be sure to read and understand your local laws. Aside from the legality, there are benefits in looks and performance when choosing a Compact Muzzle Brake. Muzzle brakes, besides looking cool, divert the gasses exiting the barrel in such a way that reduces recoil and muzzle rise, and can improve follow-up shot accuracy. More Questions? We have an article on muzzle brakes\u00a0just for you.\u00a0<\/div>\n<div>\u00a0<\/div>\n<div>\u00a0<\/div>\n<div><em>Don\u2019t forget to get a pistol-brace for this build.<\/em><\/div>\n<div>\u00a0<\/div>\n<div>\n<h3><strong>Shipping Restrictions: This item is restricted from shipping to\u00a0California, Colorado, Connecticut, Delaware, Hawaii, Illinois,\u00a0Maine,\u00a0Maryland,\u00a0Massachusetts, Nevada, New Jersey, New York, Oregon, Rhode Island, Vermont, Washington, Washington D.C., Philadelphia, York City, Reading Pennsylvania, Delaware County Pennsylvania<\/strong><\/h3>\n<p>Under California law, this product is or contains an unserialized \u201cfirearm precursor part\u201d and cannot be sold into the State of California. 80% Arms cannot accept any orders of this product for shipment to the State of California, or to any customer who is a resident of the State of California.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This 80-percent build kit contains all the necessary high-quality parts to build your AR-15 Pistol at home! 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Buy as a complete AR-15 Pistol upper kit and save money versus purchasing the necessary [&hellip;]<\/p>\n","protected":false},"featured_media":1338,"comment_status":"open","ping_status":"closed","template":"","meta":{"_gspb_post_css":"","iawp_total_views":0},"product_brand":[23],"product_cat":[33],"product_tag":[],"class_list":{"0":"post-1308","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-polymer80","7":"product_cat-ar-15-build-kits","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>Complete 10.5\u2033 5.56\/300BLK AR-15 Pistol 80% Build Kit - 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\/complete-10-5\u2033-5-56-300blk-ar-15-pistol-80-build-kit\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Complete 10.5\u2033 5.56\/300BLK AR-15 Pistol 80% Build Kit\" \/>\n<meta property=\"og:description\" content=\"This 80-percent build kit contains all the necessary high-quality parts to build your AR-15 Pistol at home! 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