--- title: "HK MR556 A4 SBR 5.56 NATO 11\" 10rd SBR - Black" canonical_url: "https://www.kygunco.com/product/hk-mr556-a4-sbr-5.56-nato-11-10rd-sbr-black" meta: author: KYGUNCO "og:image": "https://cdn.kygunco.com/assets/products/303081/thumbnail.jpg?v=1768398527" "og:image:height": "500" "og:image:width": "500" "og:title": "HK MR556 A4 SBR 5.56 NATO 11\" 10rd SBR - 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) / [Class III](https://www.kygunco.com/category/shooting/guns/class-iii) / [Short Barrel Rifles](https://www.kygunco.com/category/shooting/guns/class-iii/short-barrel-rifles) / HCK-81001049 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/303081/main.jpg?v=1768398527) For illustration purposes only, this image may not be an exact representation of the product. # HK MR556 A4 SBR 5.56 NATO 11" 10rd SBR - Black $3,749 Online In Store ** Free Shipping Enjoy delivery to the Lower 48 States at no cost. ** NFA / Class 3 NFA transfer requirements vary by product and location. Additional documentation, approvals, or a qualified dealer may be required. Check local and state regulations to ensure eligibility and compliance before purchasing. ** 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 # 303081 Style HCK-81001049 UPC 642230274129 Condition New Manufacturer [HK USA](https://www.kygunco.com/brand/hk-usa) Model MR556 A4 Round Capacity 10 Caliber 5.56 NATO Action Semi-Auto Barrel Length 11 in The MR556 A4 SBR, HK-USA’s latest update to the commercial variant of the renowned HK416, exemplifies HK’s “no compromise” performance. Featuring a short-stroke gas piston system that prevents hot carbon fouling from entering the action, it delivers longer run times, reduced maintenance, and less wear compared to direct-impingement ARs. An adjustable gas regulator allows precise tuning for both suppressed and unsuppressed use, while fully ambidextrous controls, reduced weight, and a slimmer profile enhance handling and ease of operation. For shooters seeking an AR platform with superior capability, reliability, and durability, the MR A4 series stands as the premier choice. SPECIFICATIONS - Caliber: 5.56 x 45mm - Overall length: 27.9 in. – 31.7 in. - Overall height: 7.5 in. - Overall width: 3.07 in. - Barrel length: 11 in. - Weight: 7.67 lb (without magazine) ** 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 ## 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/hk-mr556-a4-sbr-5.56-nato-11-10rd-sbr-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 MR556 A4 SBR 5.56 NATO 11\" 10rd SBR - Black","url":"https://www.kygunco.com/product/hk-mr556-a4-sbr-5.56-nato-11-10rd-sbr-black","about":{"@id":"https://www.kygunco.com/product/hk-mr556-a4-sbr-5.56-nato-11-10rd-sbr-black#/schema//kygunco"},"breadcrumb":{"@id":"https://www.kygunco.com/product/hk-mr556-a4-sbr-5.56-nato-11-10rd-sbr-black#breadcrumb"},"isPartOf":{"@id":"https://www.kygunco.com/#website"},"potentialAction":[{"@type":"ReadAction","target":["https://www.kygunco.com/product/hk-mr556-a4-sbr-5.56-nato-11-10rd-sbr-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/hk-mr556-a4-sbr-5.56-nato-11-10rd-sbr-black#product","@type":"Product","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","gtin":"642230274129","mpn":"81001049","name":"HK MR556 A4 SBR 5.56 NATO 11\" 10rd SBR - 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