--- title: "HK USA MR556 5.56 NATO 16.5\" 10rd Semi-Auto Rifle | Black" canonical_url: "https://www.kygunco.com/product/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black" meta: author: KYGUNCO "og:image": "https://cdn.kygunco.com/assets/products/160607/thumbnail.jpg?v=1713453979" "og:image:height": "500" "og:image:width": "500" "og:title": "HK USA MR556 5.56 NATO 16.5\" 10rd Semi-Auto Rifle | Black" --- > 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) / [Rifles](https://www.kygunco.com/category/shooting/guns/rifles) / [Semi-Auto](https://www.kygunco.com/category/shooting/guns/rifles/semi-auto) / HCK-81000580 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/160607/main.jpg?v=1713453979) For illustration purposes only, this image may not be an exact representation of the product. # HK USA MR556 5.56 NATO 16.5" 10rd Semi-Auto Rifle | Black $2,890.99 ![Credova logo](https://www.kygunco.com/brands/credova.svg) As low as **$192.84**/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 Handled by our expert shippers in Bardstown, KY. ** Check Local Restrictions Not sure whether this item can be shipped to your area? Enter your ZIP code for a quick check. Item # 160607 Style HCK-81000580 UPC 642230262560 Condition New Manufacturer [HK USA](https://www.kygunco.com/brand/hk-usa) Model MR556 Hand Right Hand Finish Black Round Capacity 10 Caliber 5.56 NATO, 223 Rem Action Semi-Auto Barrel Length 16.5 in A direct descendant of the world-famous HK416, the MR556A1 is the commercial carbine from the same DNA. It offers the battlefield-proven reliability, durability and precision you would expect from a rifle that bears the name Heckler & Koch. The MR556A1 is assembled in the USA using US and German-made components and uses many of the same parts and assemblies developed for the HK416. Like the HK416, the MR556A1 uses a proprietary HK short-stroke gas piston in place of the direct-gas-impingement system found on lesser AR15-style rifles that propels exhaust gas into the upper receiver to operate the action. When adverse conditions, like dust, sand and mud are introduced, the advantage of the HK system becomes even more drastic. That is why so many of the world's elite military and law-enforcement customers have absolute trust in their HKs. Shop with KYGUNCO for the best selection, competitive pricing, and exceptional customer service. Experience the difference that comes with buying from a trusted outdoor retailer with over 20 years of experience in the industry. ### SPECIFICATIONS - Action: Semi Automatic - Caliber: 5.56x45 - Barrel Length: 16.5" - Barrel Contour: Medium - Overall Length: 33.9"-37.68" - Capacity: 10 Rounds - Weight: 8.6 lbs - Finish: Black ** 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/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black#webpage","@type":"WebPage","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"HK USA MR556 5.56 NATO 16.5\" 10rd Semi-Auto Rifle | Black","url":"https://www.kygunco.com/product/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black","about":{"@id":"https://www.kygunco.com/product/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black#/schema//kygunco"},"breadcrumb":{"@id":"https://www.kygunco.com/product/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black#breadcrumb"},"isPartOf":{"@id":"https://www.kygunco.com/#website"},"potentialAction":[{"@type":"ReadAction","target":["https://www.kygunco.com/product/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black"]}]},{"@id":"https://www.kygunco.com/#/schema/organization/kygunco","alternateName":"Kentucky Gun Company","currenciesAccepted":"USD","description":"Shop KYGUNCO for firearms, ammo, gun parts, optics, shooting accessories, and outdoor gear with online ordering and shipping options across the U.S.","email":"info@kygunco.com","foundingDate":"1946-01-01","hasMap":"https://www.google.com/maps/dir/?q=place_id:ChIJfwecWCBSaIgRguIjuoPha40","logo":"https://www.kygunco.com/logos/kygunco.svg","name":"KYGUNCO","priceRange":"$$","telephone":"+1-502-348-3594","url":"https://www.kygunco.com","@type":["Organization","LocalBusiness"],"address":{"@type":"PostalAddress","streetAddress":"401 Glenwood Drive","addressLocality":"Bardstown","addressRegion":"KY","postalCode":"40004","addressCountry":"US"},"contactPoint":{"@type":"ContactPoint","contactType":"Customer Service","telephone":"+1-502-348-3594","email":"info@kygunco.com","availableLanguage":"English","hoursAvailable":{"@type":"OpeningHoursSpecification","dayOfWeek":["https://schema.org/Monday","https://schema.org/Tuesday","https://schema.org/Wednesday","https://schema.org/Thursday","https://schema.org/Friday"],"opens":"09:00","closes":"17:00"}},"geo":{"@type":"GeoCoordinates","latitude":37.8032518,"longitude":-85.4252895},"hasMerchantReturnPolicy":{"@type":"MerchantReturnPolicy","name":"Standard Return Policy","inStoreReturnsOffered":true,"merchantReturnDays":30,"returnPolicyCategory":"https://schema.org/MerchantReturnFiniteReturnWindow","returnMethod":["https://schema.org/ReturnByMail","https://schema.org/ReturnInStore"],"returnFees":"https://schema.org/FreeReturn","refundType":["https://schema.org/ExchangeRefund","https://schema.org/FullRefund","https://schema.org/StoreCreditRefund"],"applicableCountry":"US"},"hasOfferCatalog":{"@type":"OfferCatalog","name":"KYGUNCO Catalog","url":"https://www.kygunco.com/search"},"image":{"@id":"https://www.kygunco.com/#/schema/image/1"},"knowsAbout":["Firearms sales and transfers","FFL dealers and compliance","Optics and accessories","Outdoor and hunting equipment"],"openingHoursSpecification":[{"@type":"OpeningHoursSpecification","dayOfWeek":["https://schema.org/Monday","https://schema.org/Tuesday","https://schema.org/Wednesday","https://schema.org/Thursday","https://schema.org/Friday","https://schema.org/Saturday"],"opens":"09:00","closes":"18:00"}],"paymentAccepted":["Credit Card","Credova","Sezzle"],"sameAs":["https://x.com/kygunco","https://www.facebook.com/kentuckygunco","https://www.instagram.com/kygunco","https://www.youtube.com/@thekentuckygunco","https://rumble.com/c/KYGUNCO"]},{"@id":"https://www.kygunco.com/product/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black#product","@type":"Product","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","gtin":"642230262560","mpn":"81000580","name":"HK USA MR556 5.56 NATO 16.5\" 10rd Semi-Auto Rifle | Black","sku":"160607","additionalProperty":[{"@type":"PropertyValue","name":"Model","value":"MR556"},{"@type":"PropertyValue","name":"Hand","value":"Right Hand"},{"@type":"PropertyValue","name":"Finish","value":"Black"},{"@type":"PropertyValue","name":"Round Capacity","value":"10"},{"@type":"PropertyValue","name":"Caliber","value":"5.56 NATO, 223 Rem"},{"@type":"PropertyValue","name":"Action","value":"Semi-Auto"},{"@type":"PropertyValue","name":"Barrel Length","value":"16.5 in"}],"brand":{"@type":"Brand","name":"HK USA"},"image":["https://cdn.kygunco.com/assets/products/160607/thumbnail.jpg?v=1713453979"],"mainEntityOfPage":{"@id":"https://www.kygunco.com/product/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black#webpage"},"offers":{"@type":"Offer","availability":"https://schema.org/OutOfStock","price":2890.99,"priceCurrency":"USD","url":"https://www.kygunco.com/product/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black","itemCondition":"https://schema.org/NewCondition","priceValidUntil":"2027-12-30T00:00:00.000Z"}},{"@id":"https://www.kygunco.com/product/heckler-and-koch-hk-usa-81000580-mr556-5.56-nato-or-16.5-10rd-magazine-black#breadcrumb","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","name":"Home","item":"https://www.kygunco.com","position":1},{"@type":"ListItem","name":"Shooting","item":"https://www.kygunco.com/category/shooting","position":2},{"@type":"ListItem","name":"Guns","item":"https://www.kygunco.com/category/shooting/guns","position":3},{"@type":"ListItem","name":"Rifles","item":"https://www.kygunco.com/category/shooting/guns/rifles","position":4},{"@type":"ListItem","name":"Semi-Auto","item":"https://www.kygunco.com/category/shooting/guns/rifles/semi-auto","position":5},{"@type":"ListItem","name":"HCK-81000580","position":6}]},{"@id":"https://www.kygunco.com/#/schema/image/1","@type":"ImageObject","contentUrl":"https://cdn.kygunco.com/assets/backdrops/facade.jpg","inLanguage":"en","url":"https://cdn.kygunco.com/assets/backdrops/facade.jpg"}]} ``` ## Sitemap See the full [sitemap](https://www.kygunco.com/sitemap.md) for all pages.