--- title: "HK USA MR556 A4 5.56 SBR 11\" Black" description: "11\" barrel, 5.56 NATO chambering, 1:7\" twist, adjustable stock, full-length Picatinny rail, free-float handguard, and one 30rd magazine." canonical_url: "https://www.kygunco.com/product/hk-mr556-a4-5.56-nato-11-30rd-sbr-black" meta: author: KYGUNCO "og:description": "11\" barrel, 5.56 NATO chambering, 1:7\" twist, adjustable stock, full-length Picatinny rail, free-float handguard, and one 30rd magazine." "og:image": "https://cdn.kygunco.com/assets/products/302008/thumbnail.jpg?v=1768407253" "og:image:height": "500" "og:image:width": "500" "og:title": "HK USA MR556 A4 5.56 SBR 11\" 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-81001048 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/302008/main.jpg?v=1768407253) For illustration purposes only, this image may not be an exact representation of the product. # HK MR556 A4 5.56 NATO 11" 30rd SBR - Black The HK MR556 A4 is a new 5.56 NATO short-barreled rifle with an 11" barrel, 1:7" twist, flat-top upper, full-length Picatinny rail, and free-float handguard with modular attachment points. It has an adjustable stock, detachable magazine, and includes one 30rd magazine. $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 # 302008 Style HCK-81001048 UPC 642230274112 Condition New Manufacturer [HK USA](https://www.kygunco.com/brand/hk-usa) Model MR556 A4 Round Capacity 30 Caliber 5.56 NATO Action Semi-Auto Barrel Length 11 in The HK MR556 A4 Short Barrel Rifle is a modern 5.56×45mm NATO platform built on Heckler & Koch’s renowned rifle heritage. Featuring an 11" barrel, it offers a compact profile that strikes the ideal balance between maneuverability and ballistic performance. The A4 designation includes a flat-top upper with a full-length Picatinny rail for seamless optic and accessory mounting, complemented by a free-float handguard with modular attachment points for lights, grips, and other gear. An adjustable stock and ergonomic controls enhance versatility and handling across dynamic shooting environments. This configuration comes with a 30-round magazine, providing standard capacity for training or duty use where permitted. With HK’s precision engineering and rugged construction, the MR556 A4 Short Barrel Rifle delivers reliable performance and adaptability in a compact tactical design. SPECIFICATIONS - Caliber: 5.56 x 45mm - Height: 7.5 in - Magazine Capacity: 30rd - Magazines Included: 1 - Rifle Barrel Length: 11 in - Rifle Barrel Twist: 1:7" - Magazine Type: Detachable - Rifle Overall Length: 27.9 in – 31.7 in - Weight: 7.67 lbs - Width: 3.07 in ** 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-a4-5.56-nato-11-30rd-sbr-black#webpage","@type":"WebPage","description":"11\" barrel, 5.56 NATO chambering, 1:7\" twist, adjustable stock, full-length Picatinny rail, free-float handguard, and one 30rd magazine.","name":"HK USA MR556 A4 5.56 SBR 11\" Black","url":"https://www.kygunco.com/product/hk-mr556-a4-5.56-nato-11-30rd-sbr-black","about":{"@id":"https://www.kygunco.com/product/hk-mr556-a4-5.56-nato-11-30rd-sbr-black#/schema//kygunco"},"breadcrumb":{"@id":"https://www.kygunco.com/product/hk-mr556-a4-5.56-nato-11-30rd-sbr-black#breadcrumb"},"isPartOf":{"@id":"https://www.kygunco.com/#website"},"potentialAction":[{"@type":"ReadAction","target":["https://www.kygunco.com/product/hk-mr556-a4-5.56-nato-11-30rd-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-a4-5.56-nato-11-30rd-sbr-black#product","@type":"Product","description":"11\" barrel, 5.56 NATO chambering, 1:7\" twist, adjustable stock, full-length Picatinny rail, free-float handguard, and one 30rd magazine.","gtin":"642230274112","mpn":"81001048","name":"HK USA MR556 A4 5.56 SBR 11\" Black","sku":"302008","additionalProperty":[{"@type":"PropertyValue","name":"Model","value":"MR556 A4"},{"@type":"PropertyValue","name":"Round Capacity","value":"30"},{"@type":"PropertyValue","name":"Caliber","value":"5.56 NATO"},{"@type":"PropertyValue","name":"Action","value":"Semi-Auto"},{"@type":"PropertyValue","name":"Barrel Length","value":"11 in"}],"brand":{"@type":"Brand","name":"HK USA"},"image":["https://cdn.kygunco.com/assets/products/302008/thumbnail.jpg?v=1768407253"],"mainEntityOfPage":{"@id":"https://www.kygunco.com/product/hk-mr556-a4-5.56-nato-11-30rd-sbr-black#webpage"},"offers":{"@type":"Offer","availability":"https://schema.org/OutOfStock","price":3749,"priceCurrency":"USD","url":"https://www.kygunco.com/product/hk-mr556-a4-5.56-nato-11-30rd-sbr-black","itemCondition":"https://schema.org/NewCondition","priceValidUntil":"2027-12-30T00:00:00.000Z"}},{"@id":"https://www.kygunco.com/product/hk-mr556-a4-5.56-nato-11-30rd-sbr-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":"Class III","item":"https://www.kygunco.com/category/shooting/guns/class-iii","position":4},{"@type":"ListItem","name":"Short Barrel Rifles","item":"https://www.kygunco.com/category/shooting/guns/class-iii/short-barrel-rifles","position":5},{"@type":"ListItem","name":"HCK-81001048","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.